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.
via Wikipedia infobox
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.
==Départements and communes along its course== This list is ordered from source to mouth: Mayenne: Congrier, Saint-Erblon, Senonnes Maine-et-Loire: Pouancé Ille-et-Vilaine: Eancé, Martigné-Ferchaud Loire-Atlantique: Fercé Ille-et-Vilaine: Thourie Loire-Atlantique: Soulvache Ille-et-Vilaine: Teillay, Ercé-en-Lamée, Lalleu, Tresbœuf, La Bosse-de-Bretagne, Bain-de-Bretagne, Pancé, Pléchâtel, Poligné, Bourg-des-Comptes
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