Covering a quarter of a million hectares, Tonle Sap Lake is usually only about one meter deep for much of the year. But every June the slow flow of water out of the lake reverses, and its waters begin to rise as snowmelt from the mountains of Tibet and monsoon rains swell the Mekong River system and push into the lake. Tonle Sap's depth increases up to 9 meters and its surface area expands by a factor of 5 to cover 1.25 million hectares.
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