The rivers which rise on the southern side of the chain, and flow to the Orinoco, are the _Guarico_, which receives some of the branches of the Apure, and then following a course parallel to that river, enters the Orinoco a short distance eastward of it. The islands formed by the junctions of the Apure and Guarico are three in number; the first, near the town of St. Fernando de Apure, is called _Isla de Blanco_; the second, which is very large, and is north of the Indian town of Santa Barbara, is named _Isla del Apurito_; and the third, which is between the mouths of the Guarico and Apure, is the _Isla de las Garzitas_. The Guarico, which is a very fine river, is joined near its confluence with the Orinoco, by the _Rio Mancapra_, which flows through the plains of Calabozo. The _Iguane_, the _Cachivamo_, and several others which fertilise the vast uninhabited plains of the Orinoco, flow into that river west of the junction of the great Apure. Most of these swell in the month of April, and continue to overflow their banks during three or four months, covering the low lands in their neigbourhood; they abound in alligators and fish. The _Portughuesa_, which is formed by the union of the two rivers, the _Pao_ and the _Barquisimeto_, flows through the greater part of Venezuela, and joins the Apure forty miles north-west of its mouth. _Commerce._--The relation of the commercial undertakings of these provinces will necessarily comprehend those of all the governments of Caraccas, the produce of each being nearly the same.