What is "triouzoune"

The Triouzoune is a long river in the Corrèze département, south-central France. Its source is on the Plateau de Millevaches, north of la Rigaudie, a hamlet in Saint-Sulpice-les-Bois. It flows generally south-southeast. It is a right tributary of the Dordogne into which it flows between Neuvic and Sérandon.