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Wikipedia has a page about River Charente
The Charente (Occitan: Charanta) is a 381-kilometre (237 mi) 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.