Lons-le-Saunier (lôN-lə-sōnyāˈ) [key], town (1990 pop. 20,140), capital of Jura dept., E France, at the foot of the Jura Mts. A saltwater spa since Roman times, the town has food and textile industries and varied manufactures. Parts of its Romanesque church date from the 11th cent.
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