a department in the south-east of France, which derives its name from a river, and comprehends part of Dauphiny. The eastern part is fertile, the western rather hilly. Besides the common species of grain, vines and silk are cultivated. There are some manufactures of silks, woollens, leather, &c. The department contains 550,004 hectares; and in 1816 it had a population of 284,743.