​SANTIAGO, a province of Chile, inclosed by the Pacific on the W. and by Argentina in the E., with the provinces of O'Higgins and Colchagua on the S., and those of Aconcagua and Valparaiso on the N. It is very mountainous, but agriculture is highly developed in the valleys aided by artificial irrigation. There is some mining and salt is obtained from the coastal lagoons. The capital is Santiago. Pop. (1919) 640,087.