The Mehaigne (French pronunciation: [mə.ɛɲ]) is a river in Belgium.

Its source is at Saint-Denis (La Bruyère), in the province of Namur, at an elevation of 180 metres (590 ft).

The Mehaigne river flows in a roughly eastern direction through a region called Hesbaye.

It flows into the river Meuse in the municipality of Wanze at an elevation of 85 metres (279 ft).

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