2025-07-08 00:00:00 In just a few clicks, pocket a host of nature outings for Seine-et-Marne. By foot, by bike, by horse or by waterway, the department’s beautifully preserved nature offers you an abundance of bucolic and inspirational settings just outside Paris. Set out to explore a departmental nature reserve, or ramble about by foot, bike or horse the over 320,000 acres of accessible forests and woodlands! And the Seine, Marne and Loing rivers offer no less than 1,850 km of navigable waterways to admire our beautiful department during a fun cruise or water outing. The largest department of the Paris region is sure to surprise you with the wonderful wealth of its natural and historic heritage.