库埃农河是法国的河流，位于该国西北部，流经卢瓦尔河地区、布列塔尼和下诺曼第，河道全长101公里，流域面积1,124平方公里，最终在圣米歇尔山附近注入英伦海峡。

• The Couesnon at the Sandre database

The Couesnon (French pronunciation: ​[kwenɔ̃]) is a river running from the département of Mayenne in north-western France, forming an estuary at Mont Saint-Michel. Its final stretch forms the border between the historical duchies of Normandy and Brittany. Its historically irregular course, alternating between two beds on the north and south of the Mont Saint-Michel but eventually definitely settling to the south bed, inspired the saying "The Couesnon's madness placed Mont Saint-Michel in Normandy" ("le couesnon en sa folie mit le Mont en Normandie"), as the Mont is just to the Norman side of the river's current mouth. However, the administrative boundary separating the two regions does not depend on the course of the river, and is about six kilometers west of the Mont.