Tonle Sap Lake

Tonle Sap Lake

Cambodia's heart

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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.

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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.

Available: House with water views

Available: House with water views.

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.

Reviewed by

Nicky Sullivan is an Irish freelance writer (and aspiring photographer). She has lived in England, Ireland, France, Spain and India, but decided that her tribe and heart are in Cambodia, where she has lived since 2007 despite repeated attempts to leave. She dreams of being as tough as Dervla Murphy, but fears there may be a long way to go. She can’t stand whisky for starters. She was a researcher, writer and coordinator for The Angkor Guidebook: Your Essential Companion to the Temples, now one of the best-selling guidebooks to the temples.

Tours in Cambodia

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Our top 10 other sights and activities in and around Siem Reap

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Made in Cambodia market

A celebration of art and life

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Kompong Khleang

Highly recommended

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Prek Toal bird reserve

Nature lover's delight

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Kompong Phluk

Well worth a look

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Where can I get a good massage in Siem Reap?

Before, during or after temple-hopping

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Motorcycle tours

Simply excellent

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Khmer cocktail class at Asana

Learn local cocktails

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Angkor National Museum

Ostentatious, but home to priceless artefacts

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Artisan workshops

Special souvenirs