Semnon

Semnon
Basin
Progression VilaineAtlantic Ocean
Main source Congrier
47°47′30″N 01°08′34″W / 47.79167°N 1.14278°W / 47.79167; -1.14278
Source elevation 90 m (300 ft)
River mouth Vilaine
47°53′59″N 01°45′25″W / 47.89972°N 1.75694°W / 47.89972; -1.75694Coordinates: 47°53′59″N 01°45′25″W / 47.89972°N 1.75694°W / 47.89972; -1.75694
Mouth elevation 7 m (23 ft)
Basin area 400 km2 (150 sq mi)
Countries France
Length 73.3 km (45.5 mi)
Avg. discharge 2.8 m3/s (99 cu ft/s)

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. It is a left tributary of the Vilaine into which it flows between Pléchâtel and Bourg-des-Comptes.

Départements and communes along its course

This list is ordered from source to mouth:

Notes

References


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