Origin
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 the Oirá River which has a very narrow and steep valley and forms the border line between the two countries for a distance of 41 km. The Oirá River starts in Venezuela and its thalweg forms that border for several kilometres downstream. The Uribante River is longer than the Sarare and flows from the Táchira-Mérida border, near the town of Pregonero. The Apure's drainage area thus includes the slopes of both the Colombian (less than 0,5% of its total area) and the Venezuelan Andes.
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