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The Mekong Delta is living perilously close to disaster. The damming of the river by countries to the north of Vietnam - China, Cambodia and Laos is killing fish stocks - and forcing some species of river dolphin and giant catfish to the verge of extinction. But worse, the dams have cut the natural sediment that should be flowing downstream by half - meaning that the Delta wetlands are no longer being reinforced against the power of the sea. (Photo: The Mekong Delta. Credit: Dung Tuan Nguyen)