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Tonle Sap River change direction

A Guide to The Tonlé Sap Rive

The Tonle river changes direction twice a year: when the monsoon arrives, the flow from the Mekong backs up to the central plain and when the rains end, the river reverses direction and empties the flood back out into the Mekong. Passengers of our famous Tonle River Cruises get the chance to experience the magical capital of Cambodia, Phnom Penh. This vibrant city sits astride the confluence of the Tonle and Mekong rivers and is our home port on the Lower Mekong It is hard though to believe that a River cannot change its current. Once it flows it flows from upper part to the lower part but Tonle Sap changes its curre..

Maphead: Ken Jennings on Cambodia's Tonle Sap River

(22 Nov 1999) Natural Sound Huge crowds have gathered in the Cambodian capital, Phnom Penh, to celebrate a unique phenomenon; the reversal in the flow of the.. Flowing into the Mekong during the dry season, the Tonle Sap river normally changes direction around June when monsoon rains raise the levels of the Mekong, forcing water back up the river and swelling the lake to four times its size during dry season This seasonally flooded lake is connected to the Sangker River and the Tonle Sap River, which changes direction throughout the year. In the monsoon season, the Mekong River, where the Tonle Sap usually flows, sees its flow increase so that the flow of the latter, a smaller river, is reversed to flow northwards, flooding the lake During the dry season, the Great Lake drains into the Mekong River via the Tonle Sap River, which has reverted to the downstream direction and allowed the drainage from the lake and inundated the floodplain. As a result, the 120 km long Tonlé Sap River flows six months a year from the southeast (Mekong) to northwest (lake) and the rest six months in the opposite direction. This hydrological. Each time the Mekong reaches a new low, the pulse that keeps Tonle Sap Lake alive slows. This year, according to officials, the water in the Tonle Sap River reversed course in July — about two..

Mekong River (88%) through the Tonle Sap River (87%) and overland flooding (1%), while the rest evaporates directly (12%). Sediments and Productivity An important aspect of the Tonle Sap Lake is the influx of sediments and their effects on the productivity of the lake and the surrounding floodplains. It is commonly understood that muc The Tonle Sap is the beating heart of Cambodia and the Mekong basin. The heart requires the annual flood pulse, which provides water, nutrients and sediments, to remain healthy, said Gary.

But what makes it truly one of a kind is not its size, but the river of the same name that feeds it - it's the only river in the world that changes direction twice a year The Tonle Sap River is unique: it changes direction twice a year. The increase in the water level of the Mekong leads to a change in the direction of the river. The waters of the Tonle Sap River, which connects the lake and the Mekong River, turn back and fill the lake Tonle Sap River. The Mekong is responsible for a unique ecological phenomenon, where this tributary changes direction six-monthly. Man-made modifications in the upper Mekong basin threaten this highly unique ecological process and have already irreversibly impacted this complex, but vital ecosystem. Similarly, Vietnam has a rice-based agricultural sector, occupying over 80 per cent of the.

This means, the Tonle Sap river, connecting the lake with the Mekong river, regularly changes its direction. Usually it is the outlet of the Tonle Sap lake, but in June it becomes an inflow of water to the lake. The reason is the flood of the Mekong river fed by snow melting in the Himalayas and heavy monsoon rainfalls at the same time. The increasing Mekong water level then reverses the flow. In November, when the Mekong River carries less water, the flow direction of the Tonle Sap River changes. Then huge quantities of water flow back from Tonle Sap Lake to the Mekong River, and the surface of the lake shrinks to 2,500 sq. km, its maximum depth amounts to 2 - 3 m only. Due to this unique natural phenomenum Tonle Sap Lake is very rich in freshwater fish. In the floodplains rice has. Tonle Sap river: lt;p|> | | | ||| ||This article contains |Khmer| text.| Without proper |rendering support|, you World Heritage Encyclopedia, the aggregation of. In June and November the Tonle Sap River changes direction. In June, with monsoon rains swelling the Mekong, excess water is pushed into the Tonle Sap that then drains back upstream into the lake, flooding the surrounding low plains. By monsoon's end, in November, the pressure is relieved and the Tonle Sap reverses course and returns to the direction of flow expected of it. However, the.

Why does the Tonle Sap river change directions? Monsoon winds from the southwest bring a rainy season to Southeast Asia between May and October every year. The Mekong River swells so much that the Tonle Sap River is actually forced to flow backward, northward away from the sea. It's the only river in the world that goes both ways. Which is the largest saltwater lake in Asia? Chilika lake. In June and November the Tonle Sap River changes direction. In June, with monsoon rains swelling the . Mekong, excess water is pushed into the Tonle Sap that then drains back upstream into the lake, flooding the surrounding low plains. By monsoon's end, in November, the pressure is relieved and the Tonle Sap reverses course and returns to the direction of flow expected of it. However, the.

A Geographer's Notebook: the reversing river Financial Time

As the river flow flips from a downstream to an upstream direction, the Tonle Sap lake starts to fill up at an instant, bringing along millions of fish from the Mekong and allowing river ships to enter. Suddenly, the thousands of amazingly tall stilted houses that perch on what resembles a swamp make perfect sense. By September, the water level of the Tonle Sap lake would have increased to. Nokor Khmer, Employment and Labour Relations, Labour Law, Garment Sector, Ministerial Regulations on Labour Sector, ASEAN Business News, OECD, Europ Climate Change Impact Part 3: Example - Tonle Sap Lake - Cambodia. Summary. This study related to the estimation of vulnerability (as a function of 'importance' and 'risk') to climate change of roads and communities surrounding Tonle Sap lake. A mathematical model of Tonle Sap lake and the channel linking it the River Mekong was developed. This model was able to accurately simulate. Tonlé Sap, commonly translated to Great Lake, refers to a seasonally inundated freshwater lake, the Tonlé Sap Lake and an attached river, the 120 km long Tonlé Sap River, that connects the lake to the Mekong River. They form the central part of a complex hydrological system, situated in the 12,876 km² Cambodian floodplain covered with a mosaic of natural and agricultural habitats.

The Tonle Sap The Tonle Sap river changes direction

  1. The Tonle Sap is unique because the water in it changes directions twice annually. As a result the level of the lake bottoms out during the dry season but can then swell by as much as 10 meters in the summer months. For this reason villages on the Tonle Sap are considered floating- homes, especially in Kompong Khleang, are either on stilts or are literally buoyant through the use of petrol.
  2. The Tonle Sap River is unique: it changes direction twice a year. The increase in the water level of the Mekong leads to a change in the direction of the river. The waters of the Tonle Sap River, which connects the lake and the Mekong River, turn back and fill the lake. It floods the surrounding fields and forests over thousands of square kilometers. As a result, the area of the lake in August.
  3. Hydrological regime and pulsing system In the wet season, flooding in the Mekong River causes the Tonle Sap River to change its direction and flow northwest (upstream) into the Tonle Sap Lake. The area of the lake varies between dry and wet season from 2500 km2 up to about 15 000 km2, while the depth of the lake increases from less than 1 m to 6 - 9 m. During the wet season, the volume of the.
  4. During the monsoon months, Tonle Sap expands as if inhaling, fed by a Mekong River so engorged with water that it changes direction. When that happens, the lake — the largest in Southeast Asia.
  5. As a result, the lake changes in size dramatically in coincidence with the flow of the Mekong River. During peak dry season, the lake covers an area of 2500 square kilometers and has a length of 160 km. During this time the Tonle Sap river, which connects the lake with the larger Mekong River, flows south, and water drains from the lake into the lower Mekong River and towards the ocean. During.
  6. TONLE SAP CASE STUDYThe Tonle Sap Lake in Cambodia is the largest permanent freshwater body in Southeast Asia. Cambodian floodplains including Tonle Sap floodplains contain the largest wetland habitats in the Mekong system ( Figure 2). The area is globally unique and the lake has an extraordinary hydrological system: in the wet season, the Tonle Sap River changes its direction and flows to the.

Cambodia's Tonle Sap, an expansive lake that can swell across a floodplain up to 20 times the size of Singapore during the monsoon season, is experiencing a third consecutive year of dire conditions. Station readings recorded a level of just 3.86m on Aug 31, nearly 1m lower than in 2020 and about half the normal average at this time of the year Tidal rivers do this all the time. I live near one such river. The reversal is often for only part of the river, called the tidal reach. When the tide comes in, the water flow is towards the source of the river. In a few rivers around the world, t.. In many river basins, changes in sediment supply have affected the geomorphology of and flows reverse direction, draining from Tonle Sap Lake to the Mekong mainstream via Tonle Sap River (Fujii et al., 2003, Masumoto, 2000). The majority of water in the Lake in the wet-season is from the Mekong mainstem (Lu et al., 2014b), and the delayed release of this water provides important fresh.

Tonlé Sap - Wikipedi

The lake is connected to the Mekong by the Tonle Sap River at Phnom Penh (see Figure 1.1). Due to higher water levels in the Mekong during most of the wet season the Tonle Sap River flows toward the lake thereby enlarging it 3 to 6 times from 2,700 km2 to 9,000-16,000 km2. In the dry season the flow direction is reversed. Then the lake supplies water to the Mekong and thereby raises the dry. The water level in Tonle Sap is lower than it was last year at this time, according to the sole recording station that the Mekong River Commission monitors (it is located where the Tonle Sap River. The river on the left, the Tonlé Sap, changes flow direction seasonally. During the dry season from November to May it flows south, draining into the Mekong at Phnom Penh. The direction changes during the wet season, causing a rise in water levels in the surrounding floodplains and forming a large lake further north (not pictured). This image, also featured on the Earth from Space video.

The lake has an extraordinary hydrological system: in the wet season, the Tonle Sap River changes its direction and flows to the Tonle Sap Lake because of the flooding of the Mekong River in June-September (Figure 1). The lake functions as a natural flood water reservoir for the Mekong system and supports the Mekong delta by the stored flood waters in the dry season. The area of the lake. Mekong River and the Tonle Sap system T. A. Cochrane1, M. E. Arias1,3, and T. Piman2 1Dept. of Civil and Natural Resources Engineering, University of Canterbury, Christchurch, New Zealand 2Climate Change and Adaptation Initiative, Mekong River Commission, Vientiane, Lao PDR 3Sustainability Science Program, Harvard University, Cambridge, USA Correspondence to: T. A. Cochrane (tom.cochrane. Tonlé Sap (Khmer: ទន្លេសាប IPA: [tunleː saːp], literally large river (tonle); fresh, not salty (sap), commonly translated to 'great lake') is a seasonally inundated freshwater lake, the Tonlé Sap Lake and an attached river, the 120 km (75 mi) long Tonlé Sap River, that connects the lake to the Mekong River. They form the central part of a complex hydrological system, in. Thus the flow changes its direction and water discharges from the Tonle Sap lake towards the Mekong River. Hydrologically, the lake functions as a regulatory reservoir for the Mekong Delta of Vietnam [ 36 , 40 ], storing approximately 50 % of total Mekong inflow and releasing 90 % of outflow to the Mekong River [ 41 ], providing a freshwater inflow to the downstream region in dry season [ 42 ] BANGKOK: Southeast Asia's largest freshwater lake reached historically low water levels at the end of last month, raising further concerns about the situation of a critically important ecosystem that feeds the reaches of the lower Mekong river basin. Cambodia's Tonle Sap, an expansive lake that can swell across a floodplain up to 20 times the

Rakesh Rak: Tonlé Sap River, Which changes its flow

This festival is when Cambodia celebrates the end of the wet season and the change of direction by the mighty Tonlé Sap River. The city celebrates by hosting a three day manic festival of boat races, concert night time revelry. Bon Om Touk Overview and Visitor Guide. At times it appears as if the whole of Cambodia has crammed along the banks of the Mekong to cheer on their town's tail-boat. The Tonle River connects the Mekong main channel at Phnom Penh with the great Tonle Sap or lake. This section is the prettiest part of your river journey as the river narrows between Phnom Penh and Kampong Channang and one passes through villages, woodland and hills. The Tonle River is of interest as it changes direction twice a year: with the coming of the monsoon in July the main Mekong. flow changes direction twice a year, and the portion that forms the lake expands and shrinks dramatically with the seasons. From November to May, Cambodia's dry season, the Tonlé Sap drains into the Mekong River at Phnom Penh. However, when the year's heavy rains begin in June, the Tonlé Sap backs up to form an enormous lake. ORIGINS The Tonlé Sap Lake is linked to the sea via the.

Tonle Sap - Tara River Boat Travel - taraboa

During the monsoon season so much water floods the Mekong that the connected Tonlé Sap river reverses direction and sends water back into the lake, causing its footprint to increase by five times. Our imaginary journey ended in Vietnam and the Mekong Delta, where the river is crowded with traders and farmers; the population density here is five times that of the rest of the river. More than. The Tonle Sap, together with the mighty Mekong River, define the lives of the Khmer people, providing the irrigation, needed to grow rice, and the fish that provides the protein. Without these, the great Angkor kingdom could not have flourished, and what was once the world's largest city, Angkor Thom, perched on the northeast side of the great lake next to the present day city of Siem Reap. On a map, Lake Tonle Sap looks like a tipped- over violin, with its neck, the Tonle Sap River, stretching southeast to join the Mekong River at Phnom Penh. Every year, monsoon rains force so much water down the Mekong that the Tonle Sap River changes direction and flows back into the lake, swelling the violin into a cello roughly five times its dry- season size. When the rains abate, the river. The river on the left, the Tonlé Sap, changes flow direction seasonally. During the dry season from November to May it flows south, draining into the Mekong at Phnom Penh. The direction changes during the wet season, causing a rise in water levels in the surrounding floodplains and forming a large lake further north (not pictured). Read more. Home. Home Home; MyEarthnet; Featured Image.

The Tonle Sap is unusual for two reasons: its flow changes direction twice a year, and the portion that forms the lake expands and shrinks dramatically with the seasons. From November to May, Cambodia's dry season, the Tonle Sap drains into the Mekong River at Phnom Penh. However, when the year's heavy rains begin in June, the Tonle Sap backs up to form an enormous lake Climate change is unequivocal. Farmers are increasingly vulnerable to floods and drought. In this article, the negative impact of climate hazards on rice cultivation in the Tonle Sap and Mekong River influenced by climatic variability between 1994 and 2018 are analyzed. A cohort of 536 households from four Cambodian districts participated in household surveys designed to consider how various. Like the Mekong River as a whole, Tonle Sap Lake is beset by problems both local and global. In recent years, a trifecta of climate change, overfishing and the creation of new dams has threatened. Flood pulses occur annually along the Tonle Sap River (TSR) due to the large volume of water flowing from Tonle Sap Lake (TSL), its tributaries, and the Mekong River (MR). This study describes the seasonal changes in inundation area and water volume in the floodplain along the TSR over three years. The method employed time series remote sensing images of Moderate Resolution Imaging.

The Tonle Sap river is starting to change direction today. It's an incredible sight. Top. CEOCambodiaNews Expatriate Posts: 46339 Joined: Sat Oct 11, 2014 10:13 pm Location: CEO Newsroom in Phnom Penh, Cambodia. Re: At a Cambodian Lake, a Climate Crisis Unfolds. Post by CEOCambodiaNews » Thu Aug 20, 2020 5:35 pm. Water Volume in Tonle Sap Lake Still Below All-Time Lows AKP Phnom Penh, August. Houseboats on Tonle Sap Lake, Cambodia. The Tonlé Sap (Great Lake) is a combined lake and river system of huge importance to Cambodia. It is the largest freshwater lake in South East Asia and is an ecological hot spot that was designated as a UNESCO biosphere in 1997. The Tonlé Sap is unusual for two reasons: 1) its flow changes direction. Tonle Sap lake is fed in large part by the Tonle Sap river, a unique tributary of the Mekong that reverses course twice per year. Flowing into the Mekong during the dry season, the Tonle Sap river normally changes direction around June when monsoon rains raise the levels of the Mekong, forcing water back up the river and swelling the lake to. Water level variation substantially affects the trophic levels in a lake. The primary objective of this research is to investigate the impact of water level fluctuation on sediment and phosphorous (P) dynamics in Tonle Sap Lake (TSL), Cambodia. Water samples were collected from eight cross sections in a lake at 3-month intervals for 3 years, during the low-water period (March and June) and.

Tonle Sap River Cruise in 2021/2022/2023 Official Pandaw

Tonle Sap-The reversing River

As Mekong water levels rise at the end of the annual dry season, the Tonle Sap River changes direction with flows heading upstream towards the lake from mid-June. But in its wet-season situation report released Thursday, the MRC's Flood and Drought Management Centre in Phnom Penh said it did not observe the reversal until Aug. 4. The delay of the reverse flow was due to the low water. reduces to the extent that the Tonle Sap River changes direction, and now water empties from the Great Lake back into the Mekong. With it travel huge quantities of fish fleeing the contracting shoreline. Without this large-scale water regulatory function of the Tonle Sap, floods in the Delta would start earlier, last longer and be deeper, and dry season flows in the delta would be even more. Tonle Sap is the largest lake in South-East Asia and is a wetland of international importance and is recognised by the Ramsar convention. Like most wetlands its area varies significantly through the year, from 2000 km 2 at its lowest to ten times that figure at its largest. The bed of lake is close to sea level and its maximum level is normally only 10 m above sea level The phenomenon around Tonle Sap Lake is that it changes directions twice a year. Fed by the Mekong River (floating market post here), during summer's wet season, the river can grow 20 km beyond it's normal size and anywhere from 2-10m deep. During dry season, it reverse direction, making the stilts make the houses look like towering cranes soaring overhead. . Table of Contents: The.

CAMBODIA: TONLE SAP RIVER - REVERSAL FLOW - YouTub

  1. During the wet season, the high flows in the Mekong River cause the Tonle Sap River to reverse its flow direction to flood the Great Lake. During the peak of the flood season, the Great Lake's surface area increases six-fold, from around 2,500 km 2 to around 15,000 km 2 , and its volume increases from around 1.5 km3 to around 60-70 km 3
  2. They change direction through river changes can be called old. Bank Erosion Pattern Analysis by Delineation of Course Migration of the Padma River at Harirampur Upazila Using Satellite Images and GIS Part II. Before modern dams became an hit, continue reading. Differences between river can be supported by rivers changing direction. We have fun.
  3. A river barge carries sand on the Tonle Sap, in Phnom Penh, Cambodia, Oct. 7, 2019. The miracle of the Mekong, where the pulsating force of the monsoon-driven river every year pushes its tributary.
  4. The Tonle river changes direction twice a year: when the monsoon arrives, the flow from th The Tonle Sap Lake (otherwise known as the Great Lake) is a combined lake and river system in Cambodia. It is the largest fresh water lake in Southeast Asia and the richest fishing lake in the World. The Tonle Sap is a unique ecological hot sport Aber diese kleine Einlage konnte unsere Stimmung nicht.
  5. The Tonle Sap (In Khmer: Large Fresh Water River, but more commonly translated as Great Lake) is a combined lake and river system of major importance to Cambodia. The Tonlé Sap is the largest freshwater lake in South East Asia and is an ecological hot spot that was designated as a UNESCO biosphere in 1997. The Tonlé Sap is unusual for two reasons: its flow changes direction twice a year.
  6. The Tonle Sap is the beating heart of Cambodia and the Mekong basin. The heart requires the annual flood pulse, which provides water, nutrients and sediments, to remain healthy, said Gary Lee the Southeast Asia program director for International Rivers, a non-profit organisation
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Tonle Sap Lake is the largest lake in SE Asia and one that exhibits a unique hydrological system. Each year, as a result of the increased flow of the Mekong River during the SW mon-soon, the Tonle Sap river changes direction and floods the lake, increasing its area from 2500 km2 to between 10,000 and 16,000 km2 (Lim et al., 1999). This creates a highly dy-namic ecosystem, with seasonally. The hydrology of the Tonle Sap ecosystem is mostly determined by the over 4 000 km long Mekong river. The lake is connected to the Mekong river through the 100 km long Tonle Sap channel. The channel and the Mekong join at the Quattre Bras near Phnom Penh, after which the river immediately branches into two arms, the larger main Mekong and the smaller Bassac river. Farther downstream these two. After the peak flood season, the flow direction of the Tonle Sap changes towards the Mekong River. Starting in late September to early October until early May, the normal flow from Tonle Sap Lake. From June 2007 World Rivers Review Tonle Sap Lake is the largest freshwater lake in Southeast Asia and of great importance to Cambodia and the Mekong River ecosystem as a whole. Located in Northwest Cambodia and connected to the Mekong River via the Tonle Sap River, its ecological value was recognized in 1997 when it was designated a UNESCO biosphere reserve

Bonn Om Touk - Cambodia's Water Festival - Crystal Holidays

Tonle Sap Lake or the Great Lake More than three million people inhabit the banks of this lake and 90% of them earn their living by fishing and working in agriculture around Tonle Sap Lake. The Lake is the largest freshwater area in South East Asia and its dimension and flow change depending on the monsoon and dry season There is a saying that water never flows backwards, but the Tonle Sap River in Cambodia is the only place in the world where water reverses its direction of flow. At the same time, hundreds of millions of fishes weighing millions of tons migrate along with the flow. Giant barb and giant catfish which are the kings of fish are the first to leave the lake. They are followed by a.

Cambodia's Tonle Sap shows what's at stake in the Mekong's

At this time, the Tonle Sap is forced by the Mekong's current to reverse direction, thus providing necessary water to the flood plain around the Tonle Sap Lake. During the 2011 floods, Kompong Pluk suffered but was able to cope with the unnatural levels of flooding with better flexibility than many surrounding communities. I also was moved by the community's deep connection to Neak Ta. The Tonle River is the Mekong's main tributary that flows down from the Tonle Sap or Great Lake in central Cambodia. That giant body of water is 100km from end to end and in the rains it quadruples in size flooding much of the surrounding floodplain. The Tonle river changes direction twice a year: when the monsoon arrives, the flow from the Mekong backs up to the central plain and when the. Cambodia's 'beating heart' and climate change disaster. Southeast Asia's largest lake - the Tonle Sap - has been decimated by global warming-related drought, Cambodians say

Damming the Mekong: China, Laos, Cambodia and the fate ofAll about Cambodia’s Water Festival | GVI USA

During the rainy season the stream of the river changes the direction and the lake increases its surface hugely (2,500 km 2 to 16,000 km 2). Explore the gorgeous landscapes, the floating villages in the lake with its floating school, houses, markets, and meet their inhabitants and their lifestyles. Take on board with us in this fantastic trip! The Tonle Sap Lake is one of the worlds most. Tonle Sap Cambodia's Tonle Sap, or Great Lake, is one of the unique geographical wonders of the world.It offers visitors insights into the centuries-old traditions of riparian life and the natural splendor of the country. On the banks of the mighty Great Lake and the Tonle Sap and Mekong Rivers, Khmers have celebrated for over two hundred years the changing of the river's flow The flow of water in Tonlé Sap changes direction twice during the course of the year, expanding and contracting with the seasons. Learn more. Tonlé Sap. Close. This great lake covering 1,000 square miles (2,600 square kilometers) is not only the largest body of fresh water in Southeast Asia, it's also a UNESCO-designated biosphere due to its remarkable natural features. The flow of water. The Tonle Sap River constantly changes directions depending on the time of year. Rivers of Our Time - Phillipines The Bicol River passes through the valley and flows directly into the Pacific Ocean If you can identify a landmark or person please send details to: digitalrepository@asu.edu. Thank you for helping describe and caption this important historical image.Bon Om Touk, or the Water Festival, celebrates the Tonle Sap River's annual change of direction in its water flow; this is the only waterway in the world that flows in opposite directions at different times of the year. The level.

Tonle Sap Lake - A travel guide on a real Water Worl

The Tonle Sap is a combined lake and river system. It is the largest freshwater lake in Southeast Asia. It was named a UNESCO biosphere in 1997 due to its status as an ecological hot spot. The Tonle Sap is very unusual in that its flow changes direction twice a year The Tonle Sap River connects the lake to the Mekong River, which it joins at the Chaktomuk junction near Phnom Penh. The lake has an extraordinary hydrological feature: during the wet season, the Tonle Sap River changes its direction and flows into, instead of away from the lake, due to the flooding of the Mekong River. This pulsing system makes the Tonle Sap a highly produc- tive wetland. River changes its flow from west to east at Phnom Penh, where the two rivers, the Tonle Sap River and the Bassac River, diverge. There is the Tonle Sap Lake at the north boundary of the Tonle Sap River. The Tonle Sap Lake is the largest freshwater storage in the Southeast Asia, which covers an area of about 13000 km2 [1]. The Tonle Sap flow system is well known because of its unique. The full text of this article hosted at iucr.org is unavailable due to technical difficulties

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dro-drw) Pictures of the Tonle Sap dro) bamboo hut on a sandbank drp) Sarus Cranes (Grus Antigone) drq) Post houses on the lake shore drr) Floating village drs) floating market drt) fisherman with throw net dru) Fishing boat in the mangrove belt drv) double hornbill (Buceros bicornis) drw) Cormorant drying the plumage 2650 A 500 R multicolored dro 2651 A 900 R multicolored drp 2652 A 1000 R. These approaches can avoid upstream fragmentation between the Tonle Sap and the rest of the Mekong system. This way, the monsoon pulse which each year reverses the direction of the river, draining the lake and sending 70 times more water, organic material and fish back into it, can be preserved Our table overlooked the Tonle' Sap River right near its conjunction with the Mekong River. Each year the fluctuation of the water volume of the Mekong, supplemented by the monsoons, causes the Tonle' Sap to reverse its flow away from the South China Sea. It is a unique example of the influence that one body of water can have over another in influencing the direction in which it is heading. The Tonlé Sap is unusual for two reasons: 1) its flow changes direction twice a year, and 2) the portion that forms the lake expands and shrinks dramatically with the seasons. From November to May, Cambodia's dry season, the Tonlé Sap drains into the Mekong River at Phnom Penh. However, when the year's heavy rains begin in June, the Tonlé Sap backs up to form an enormous lake. Wikipedia.