A mountainous province of the Argentine Republic, on the Chilian border; is rich in metals, but, save coal, not worked; agriculture is the chief industry. San Juan, on a river of the same name, is the capital, lies 98 m. N. of Mendoza; has public baths, a bull-ring, library, &c.; exports cattle and fodder, chiefly to Chile. The name of numerous other towns in different parts of Spanish South America.