In which river in Southeast Asia is a small population of Irrawaddy dolphins found?

Fact

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A small population of Irrawaddy dolphins lives in the Mekong River, mainly between Cambodia and Laos. Despite their name, these cetaceans can frequent coastal waters, estuaries and certain large rivers. The Mekong population is seriously threatened by accidental capture, river modifications and other human pressures. However, the Mekong is not the only river home to freshwater dolphins: the Ganges has its own dolphins and the Amazon is home to the boto. The question must therefore specify the species of the Irrawaddy so that the Mekong is the only correct answer.