Rivers of Ille-et-Vilaine

thumb|right|250px|The Vilaine in Bruz The Vilaine (; ) is a river in Brittany, in the west of France. The river's source is in the Mayenne département (53), and it flows out into the Atlantic Ocean at Pénestin in the Morbihan département (56). It is 218 km long.

river in France

The Couesnon (; ) is a river running from the département of Mayenne in north-western France, forming an estuary at Mont-Saint-Michel. It is long, and its drainage basin is . Its final stretch forms the border between the historical duchies of Normandy and Brittany. Its historically irregular course, shifting between two beds to the north and south of Mont-Saint-Michel until eventually settling on the southern one, inspired the saying Le Couesnon en sa folie mit le Mont en Normandie (“The Couesnon in its madness placed the Mont in Normandy") as the Mont is just to the Norman side of the river’

The Ille (; ) is a small river in Brittany, France, right tributary of the river Vilaine. It is long. It flows into the Vilaine in the city Rennes.

The Oust (; ) is a river in Brittany, France, right tributary of the Vilaine. It is long. Its source is in the hills between Corlay and Quintin. It flows generally southeast, through the following départements and towns:

The Chère (; ) is a long river in the Loire-Atlantique and Ille-et-Vilaine départements, northwestern France. Its source is at Soudan. It flows generally west. It is a left tributary of the Vilaine into which it flows between Pierric and Sainte-Anne-sur-Vilaine.

The Semnon (; ) is a long river in the Mayenne, Maine-et-Loire, Ille-et-Vilaine and Loire-Atlantique départements, northwestern France. Its source is in Congrier. It flows generally west-northwest. It is a left tributary of the Vilaine into which it flows between Pléchâtel and Bourg-des-Comptes.

The Meu (; ) is an long river in the Côtes-d'Armor and Ille-et-Vilaine départements, in northwestern France. Its source is at Saint-Vran, west of the village. It flows generally southeast. It is a right tributary of the Vilaine into which it flows at Goven, northeast of the village.