Satellite map of Semnon
The Semnon (French: le Semnon) is a 73.3 km (45.5 mi) long river in the Mayenne, Maine-et-Loire, Ille-et-Vilaine and Loire-Atlantique départements, western France. Its source is at Congrier. It flows generally west-northwest.
Latitude: 47° 47' 17.99" N
Longitude: -1° 08' 20.40" W