The Salas River is a tributary of the Lima. It rises in the Larouco mountains (), 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 () before being dammed up by the Encoro de Salas. It flows into the Galician Minho River near the town of Lobios.