Wikipedia has a page about River Charente
The Charente (Occitan: Charanta) is a 381 km long river in southwestern France. Its source is in the Haute-Vienne département at Chéronnac, a small village near Rochechouart. It flows through the departments of Haute-Vienne, Charente, Vienne and Charente-Maritime. The river flows into the Atlantic Ocean near Rochefort.