The Apure River is a river of western Venezuela, formed by the confluence of the Sarare and Uribante near Guasdualito, in Venezuela. Most of the streams that ultimately form the Apure originate in the Venezuelan highlands of the Cordillera de Mérida and only some minor affluents of the Sarare River come from the Cordillera Oriental in the Colombian Andes, entering Venezuela at the confluence with River Oirá which has a very narrow and steep valley and forms the border line between the two countries for a distance of 41 km. River Oirá starts in Venezuela and its thalweg forms that border for several kilometres downstream. River Uribante is a longer river than the Sarare and flows from the Táchira-Mérida border, near the town of Pregonero. The length of the Uribante River should be added to the Apure, the same way it has being done with many rivers in the world. At the point where the two rivers join, the Apure flows eastward across the Venezuelan llanos, into the Orinoco.