The Grand Morin (French pronunciation: [ɡʁɑ̃ mɔʁɛ̃], literally Great Morin) is a 118-kilometre (73 mi) long river in France, left tributary of the Marne.

It flows westwards through the towns of Esternay, La Ferté-Gaucher, Coulommiers and Crécy-la-Chapelle, finally flowing into the Marne in Esbly.

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