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The Tonle Sap is the largest inland fishery in all of Southeast Asia. The reverse pulse of the Tonle River, which pushes water upstream into the lake and expands the floodplain of the lake eight fold, accounts for the high productivity of this lake as fish travel from the Mekong to the lake to spawn. But the threat of drought and upstream hydropower development threaten this natural 'pulse' and the food security of millions of people in Cambodia and the Mekong region.

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