Thérain

LocationCountryFrancePhysical characteristicsSource  • elevation175 m (574 ft) Mouth Oise49°14′27″N 2°27′1″E / 49.24083°N 2.45028°E / 49.24083; 2.45028Length94 km (58 mi)Basin featuresProgressionOise→ Seine→ English Channel

The Thérain (French pronunciation: [teʁɛ̃]) is a river in France, tributary of the Oise. It is 94.4 km (58.7 mi) long.^[1] 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.

• 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