|Length||118 km (73 mi)|
|Basin area||1,180 km2 (460 sq mi)|
The Grand Morin is a 118-kilometre (73 mi) long river in France, left tributary of the Marne. Its source is near the village of Lachy. Its course crosses the departments of Marne and Seine-et-Marne. It flows westwards through the towns of Esternay, La Ferté-Gaucher, Coulommiers and Crécy-la-Chapelle, finally flowing into the Marne in Esbly.
Its main tributary is the Aubetin.
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