It rises in the Larouco mountains (pt:Serra do Larouco), within the municipality of Baltar, Ourense, Galicia.
It flows through the territory of the Couto Misto, a former independent state, and the Portuguese village of Tourém (pt:Tourém) before being dammed up by the Encoro de Salas, back in Spain.
It flows into the Limia River near the town of Lobios.
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