Choco, formerly a province of New Granada, now a district of the state of Cauca, in the United States of Colombia, bordering on the Pacific and touching the gulf of Darien on the N. E.; pop. about 45,000, mostly negroes and mulattoes, with a few whites and Indians. It is traversed by the western branch of the Andes, and drained by the San Juan and Atrato rivers. The climate is warm, moist, and unhealthy. The soil is rich and productive, but agriculture is generally neglected, almost everything that is consumed, excepting plantains, fruit, and fish, being imported. Gold is abundant in the mountains and in the beds of the streams, and platinum is found on the W. side of the Cordillera; but mining and industry are at a low ebb. The principal towns are Quibdo and Novita. - There is a bay of the same name on the Pacific coast, between Points Guascama and Chirambira, lat. 2° 40' and 4° 18' N.; and another, forming the S. part of the gulf of Darien, which receives the Atrato.