Clain
Location
Country	France
Physical characteristics
Source
• location	Poitou
Mouth
• location	Vienne
• coordinates	46°46′52″N 0°32′26″E / 46.78111°N 0.54056°E / 46.78111; 0.54056
Length	144 km (89 mi)
Basin size	3,145 km2 (1,214 sq mi)
Basin features
Progression	Vienne→ Loire→ Atlantic Ocean

The Clain (French pronunciation: [klɛ̃]; Occitan: Clen) is a 144 km (89 mi) long river in western France, a left tributary of the river Vienne.^[1] Its source is near Hiesse, Charente.

The Clain flows generally north, through the following departments and towns:

• Charente
• Vienne: Pressac, Vivonne, Poitiers.

It joins the Vienne near Châtellerault, Cenon-sur-Vienne.

Among its tributaries are the Boivre, the Clouère and the Vonne.