Shortly before the Mekong crosses into Cambodia, it splits into countless branches, thus creating more than 4,000 river islands, the larger ones even inhabited. The distance between parallel branches reaches up to 14 kilometres. At high tide about half of the islands disappear under water. In between some of the islets water cascades over rocks, forming beautiful waterfalls. The largest of them, and actually the largest in all of Southeast Asia, is Khoug Phapheug.

This part of the Mekong is home to a rare species of freshwater dolphins. They grow to a length of 2.5 metres, and just like the dolphins of the sea, the river dolphins of the Mekong are said to have saved many people from drowning.

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