Most of the Venezuelan aboriginal population lives within the Orinoco River basin. The most important indigenous groups include the Guaica (Waica), also known as the Guaharibo, and the Maquiritare (Makiritare) of the southern uplands, the Warrau (Warao) of the delta region, and the Guahibo and the Yaruro of the western Llanos. These peoples live in intimate relationship with the rivers of the basin, using them as a source of food as well as for purposes of communication.