Thérain

The Thérain is a river in France, tributary of the Oise. It is 94.4 km long. It rises between Saint-Michel-d'Halescourt and Grumesnil in Seine-Maritime at 175 meters elevation. It flows generally southeast, through Songeons, Milly-sur-Thérain, Beauvais, Hermes and Mouy, and joins the Oise at Creil.

Its valley, near the metropolitan area of Paris, has been a highly industrialized and populated area, and Beauvais lies at the foot of wooded hills on the left bank of the Thérain at its confluence with L' Avelon.

Affluents

 * Ruisseau d'Hardouins
 * Le Tahier
 * Ruisseau de Wambez
 * Le Petit Thérain
 * L' Avelon
 * Rivière de Saint-Quentin
 * Rivière de Saint-Just
 * La Liovette
 * Le Wage
 * Ru de Berneuil
 * Fosse d'Orgueil
 * La Laversines
 * La Trye
 * Le Sillet
 * Ru de la Maladrerie
 * Ru de Lombardie
 * Le Moineau
 * Fossé l' Evêque
 * Le Ruisseau de Saint-Claude
 * Le Ruisseau de Cires
 * Le Ruisseau de Flandre