The Grand Morin River is a river located in the Île-de-France region of France. It flows through the Seine-et-Marne department and is a tributary of the Marne River. The river stretches approximately 70 kilometers and is known for its scenic landscapes and natural beauty. The Grand Morin River is popular for various recreational activities, including fishing, kayaking, and hiking along its banks. It also plays a role in local ecology, supporting diverse wildlife and plant species. The river's basin is an important area for conservation and environmental protection efforts.