The Senegalese landscape consists mainly of the rolling sandy plains of the western Sahel which rise to foothills in the southeast. Here is also found Senegal's highest point, an otherwise unnamed feature 2.7 km southeast of Nepen Diakha at .  The northern border is formed by the Senegal River; other rivers include the Gambia and Casamance Rivers. The capital Dakar lies on the Cap-Vert peninsula, the westernmost point of continental Africa.