Yapacana National Park (YNP) is located in the state of Amazonas, on the peneplain of the Ventuari and Orinoco rivers, a landscape carved by the confluence of these two rivers. Most of the National Park consists of lowlands, with very little slope or gradient, known as peneplains because of their transitional contours, where low hills blend into plains (Huber 1995a). The topography varies between 100 m (330 ft) and 1,345 m (4,400 ft) above sea level, approximately, a salient feature being Cerro Yapacana, located in the southwestern part of the Park some 40 km (25 miles) from the confluence of the Orinoco and Ventuari rivers.