The most important rivers in the state are: the Apure for which the state is named; the Arauca, at more than long, which has its source in Colombia and forms the border between the two countries for a stretch, and unites the Apure by means of various branches and springs before flowing into the Orinoco; the Orichuna Channel at more than long; the Capanaparo, Cinaruco, Cunaviche, Matiyure, and Meta.