The Cosson is a 97-kilometre (60mi) long river in central France, right tributary of the river Beuvron. Its source is near the village Vannes-sur-Cosson, in Sologne. The Cosson flows through the following departments and communes:
The château de Chambord is built in one curve of the Cosson. The Cosson flows into the river Beuvron in Candé-sur-Beuvron, less than 1 kilometre (0.6mi) from its confluence with the Loire.