The Mare aux Hippopotames (Lake of Hippopotamuses) is a lake and national park in Burkina Faso, created in 1937 and designated in 1977 as the only UNESCO Biosphere Reserve in the nation.

The park was created around a freshwater lake and includes surrounding pools and marches in the flood plain of the Black Volta River, and surrounding forests.

The park is home to about 100 hippos; about 1000 eco-tourists visit each year.

Mare aux Hippopotames is among the wetlands of international importance as defined by the Ramsar Convention.

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