Semnon

Semnon
Semnon
	The Semnon between Pléchâtel and Poligné.
	Location within France Location within Brittany
Location
Country	France
Physical characteristics
Source
• location	Congrier
• coordinates	47°47′30″N 01°08′34″W / 47.79167°N 1.14278°W
• elevation	90 m (300 ft)
Mouth
• location	Vilaine
• coordinates	47°53′59″N 01°45′25″W / 47.89972°N 1.75694°W
• elevation	7 m (23 ft)
Length	73.3 km (45.5 mi)
Basin size	400 km2 (150 sq mi)
Discharge
• average	2.8 m3/s (99 cu ft/s)
Basin features
Progression	Vilaine→ Atlantic Ocean

The Semnon (French pronunciation: [sɛmnɔ̃]; Breton: Sevnon) is a 73.3 km (45.5 mi) long river in the Mayenne, Maine-et-Loire, Ille-et-Vilaine and Loire-Atlantique départements, northwestern France.^[1] 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.

Départements and communes along its course

This list is ordered from source to mouth:

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