Therain River
General data
- Name: Therain River
- Water system: Seine
- Water type: River
- Progression: Oise River -> Seine -> English channel -> Atlantic Ocean -> Planet Earth
- Climates: Temperate
- Continents: Europe
- Countries: France
The Tharain 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.