Semnon

Semnon
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Data
Water code	FR :  J76-0300
location	France , Pays de la Loire and Brittany regions
River system	Vilaine
Drain over	Vilaine  → Atlantic Ocean
source	southwest of Congrier 47 ° 47 ′ 14 "  N , 1 ° 8 ′ 24"  W
Source height	approx.  100  m
muzzle	at Pléchâtel in the Vilaine coordinates: 47 ° 53 ′ 59 "  N , 1 ° 45 ′ 25"  W 47 ° 53 ′ 59 "  N , 1 ° 45 ′ 25"  W
Mouth height	approx.  8  m
Height difference	approx. 92 m
Bottom slope	approx. 1.3 ‰
length	73 km
Left tributaries	Brutz

The Semnon is a river in France that has its source near Congrier in the Mayenne department . He crosses the départements

• Mayenne, Pays de la Loire region
• Ille-et-Vilaine , Brittany region
• Loire-Atlantique , Pays de la Loire region , and again
• Ille-et-Vilaine

before flowing into the Vilaine after 73 kilometers at Pléchâtel as a left tributary .

Places on the river

• Senonnes
• Eancé
• Martigné-Ferchaud
• Soulvache
• Ercé-en-Lamée
• Poligné
• Pléchâtel

Remarks

1. ↑ ^{a b} geoportail.fr (1: 16,000)
2. ↑ ^{a b} The information on the length of the river is based on the information on the Semnon from SANDRE (French), accessed on November 28, 2011, rounded to the nearest kilometer.