Senegal is located on the west of the African continent. It lies between latitudes 12° and 17°N, and longitudes 11° and 18°W.
Senegal is externally bounded by the Atlantic Ocean to the west, Mauritania to the north, Mali to the east, and Guinea and Guinea-Bissau to the south; internally it almost completely surrounds The Gambia, namely on the north, east and south, except for Gambia's short Atlantic coastline.
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 westernmost point in Africa.
Senegal has a tropical climate with pleasant heat throughout the year with well-defined dry and humid seasons that result from northeast winter winds and southwest summer winds. The dry season (December to April) is dominated by hot, dry, harmattan wind. Dakar's annual rainfall of about 600 mm (24 in) occurs between June and October when maximum temperatures average 30 °C (86.0 °F) and minimums 24.2 °C (75.6 °F); December to February maximum temperatures average 25.7 °C (78.3 °F) and minimums 18 °C (64.4 °F).
Interior temperatures are higher than along the coast (for example, average daily temperatures in Kaolack and Tambacounda for May are 30 °C (86.0 °F) and 32.7 °C (90.9 °F) respectively, compared to Dakar's 23.2 °C (73.8 °F) ), and rainfall increases substantially farther south, exceeding 1,500 mm (59.1 in) annually in some areas.
In Tambacounda in the far interior, particularly on the border of Mali where desert begins, temperatures can reach as high as 54 °C (129.2 °F). The northernmost part of the country has a near hot desert climate, the central part has a hot semi-arid climate and the southernmost part has a tropical wet and dry climate. Senegal is mainly a sunny and dry country.