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Loir(lwär), river, 193 mi (310 km) long, rising S of Chartres, N central France, and flowing generally SW through a fertile agricultural region to join the Sarthe River N of Angers.
a river in northwestern France, a left tributary of the Sarthe (Loire basin). Length, 311 km; basin area, approximately 7,300 sq km. It flows mainly through a hilly plain, with its lower course flowing through the Loire Valley. The Loir is navigable for 120 km from the mouth. The city of Vendome is on the river.