The country is bordered by Guinea to the north and northeast, Liberia to the south and southeast, and the Atlantic Ocean to the west.
Sierra Leone has a total area of 71,740 km2 (27,699 sq mi), divided into a land area of 71,620 km2 (27,653 sq mi) and water of 120 km2 (46 sq mi). The country has four distinct geographical regions. In eastern Sierra Leone the plateau is interspersed with high mountains, where Mount Bintumani reaches 1,948 m (6,391 ft), the highest point in the country. The upper part of the drainage basin of the Moa River is located in the south of this region.
The centre of the country is a region of lowland plains, containing forests, bush and farmland, that occupies about 43% of Sierra Leone's land area. The northern section of this has been categorised by the World Wildlife Fund as part of the Guinean forest-savanna mosaic ecoregion, while the south is rain-forested plains and farmland. In the west Sierra Leone has some 400 km (249 mi) of Atlantic coastline, giving it both bountiful marine resources and attractive tourist potential. The coast has areas of low-lying Guinean mangroves swamp. The national capital Freetown sits on a coastal peninsula, situated next to the Sierra Leone Harbour, the world's third largest natural harbour.