The Mortagne (French: la Mortagne) is a 74.6-kilometre (46.4 mi) long river in the Vosges and Meurthe-et-Moselle départements, northeastern France.

[1] Its source is at Saint-Léonard, 5 km (3.1 mi) west of the village, in the Vosges Mountains.

It is a left tributary of the Meurthe into which it flows at Mont-sur-Meurthe, 5 km (3.1 mi) southwest of Lunéville.

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