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 near Nepen Diakha at 584 m (1,916 ft). 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.
The Cape Verde islands lie some 560 kilometres (350 mi) off the Senegalese coast, but Cap Vert ("Cape Green") is a maritime placemark, set at the foot of "Les Mammelles", a 105-metre (344 ft) cliff resting at one end of the Cap Vert peninsula onto which is settled Senegal's capital Dakar, and 1 kilometre (0.6 mi) south of the "Pointe des Almadies", the western-most point in Africa.