May 23 2011

A little about the Tonle Sap (Great Lake)

Published by at 12:47 pm under Sightseeing & activities


At the physical heart of Cambodia, an immense body of water is the soul of the nation.  The great Tonle Sap lake not only sustains Cambodian stomachs, with its harvest accounting for more than 50% of Cambodia’s protein intake, it is also a source of immense national pride.

Available: House with water views

Available: House with water views.

Its uniqueness lies in events that take place far away in the Himalayan mountains.  There, melting snows feed into the Mekong river and push down towards the South China sea off the Vietnamese coast.  En route, monsoon rains further swell the great river before it meets the Tonle Bassac and the Tonle Sap rivers at a confluence in Phnom Penh.  Here, the ‘might’ of the Mekong is sufficient to push the Tonle Sap back on itself, reversing its flow and flooding the basin area of the lake.  In the process, the area of the lake increases five-fold, from 2,500 km2 to 12,500 km2.  In some places, the water’s depth increases from one metre to 10 metres.

This staggering transformation is at the root of all of the other superlatives that can be applied to the Tonle Sap.  It’s the largest lake in Southeast Asia, one of the most productive inland fisheries in the world and, a little creepily, holds the richest snake harvest in the world too.  It is home to an exceptional array of wildlife biodiversity, depictions of which can be found on the walls of Bayon temple, recognition of their importance to the success of the Empire.

I'll seeya at the tree, in the middle of the lake

I'll seeya at the tree in the middle of the lake.

Such hyper-abundance is a consequence of the Tonle Sap’s life-giving pulse, the ebb and flow of its waters.  Along the skirts of the lake, floating forests have developed where trees have evolved that can withstand being immersed in water for several long months, their falling vegetation creating an environment that is immensely rich in nutrients for fish and other aquatic life.

Being such a vital food source, so many fish have naturally attracted predators, in particular birds and humans.  Not much more than 10 years ago, the area around Prek Toal village on the western side of the lake was found to be host to a wide array of bird species, many of whom were facing global extinction.  This discovery triggered the Wildlife Conservation Society’s programme to protect the birds and their eggs from poaching by humans through creation of the Prek Toal bird sanctuary.

Smoke on the water

Smoke on the water.

About one-third of Cambodia’s population live in the provinces surrounding the lake.  But even with the super-abundant resources the lake provides, the people living on its borders are among the poorest in the country.  Among the poorest of the poor are those who live not by but actually on the lake itself.  Some 130,000 people in live in 90 floating villages specially adapted to exist in rhythm with the rise and fall of the lake’s waters.  Their lives are precarious in many ways.

But despite its size and rich abundance, the Tonle Sap is a lake under threat.  Cambodia has been identified as a country that stands to lose a great deal to climate change, and the most vulnerable area is the great lake.  Human influence is having other damaging effects too, as the cumulative effects of over-exploitation, deforestation, agriculture, industrial pollution, dam construction, mining and the introduction of non-native species all take their toll.

There is always an antenna

There is always an antenna.

The Tonle Sap is a UNESCO Biosphere Reserve, a special area recognised and protected for its social, cultural and scientific significance.  It is also a hugely significant body of water for Cambodians who have been too often caught in the confluence of economic and political tussles not of their own making.

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7 responses so far

7 Responses to “A little about the Tonle Sap (Great Lake)”

  1. flannerson 06 Jun 2011 at 2:00 pm

    fasanating place tonle sap ;lake and locals and kids friendly but the smells can be stomach turning !!! be warned

  2. [...] and some entirely human-made (e.g. a ring-road that blocks the water's natural flow towards the Tonle Sap and turns the southeast of Siem Reap into a giant bowl of seriously dodgy soup). Philosophy [...]

  3. [...] and the communities affected not just by the Siem Reap river over-running its banks but also by the Tonle Sap lake, which is pushing far beyond its usual boundaries. They are literally sandwiched by two disastrous [...]

  4. [...] Nick: Malaria occurs in rural Cambodia though not in the Tonle Sap Lake and river belt which includes Siem Reap and Phnom Penh. If you are visiting Phnom Penh or Siem Reap [...]

  5. [...] Boulevard, and the river road. As you go move away from the roundabout, down the river towards the Tonle Sap, take the right turn about 20 yards down. Down here about 200/300 metres on the right hand side, [...]

  6. Chong Kneas | Travelfish on Cambodiaon 25 Jul 2012 at 1:49 am

    [...] banks to the west side of which you can see the edges of part of the floating forest that makes the Tonle Sap Lake such a richly abundant source of food. Along the top of the east bank, depending on the time of [...]

  7. [...] alternative and extremely important to the Cambodian countryside's annual cycle. The river links the lake of the same name at one end to its bigger cousin at the other. It flows into the Mekong between November and May [...]

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