Sierra Leone's 350-mi (560-km) Atlantic coastline is made up of a belt (average width 30 mi/50 km) of low-lying mangrove swamps, except for the mountainous Sierra Leone Peninsula (on which Freetown is situated). The coastline is broken by numerous estuaries and has some wide, sandy beaches. Behind the coastal belt is a wooded plateau (average elevation: 1,000 ft/300 m). The eastern half of the country is mostly mountainous and includes Bintimane Peak, Sierra Leone's loftiest point (6,390 ft/1,948 m), located near the Guinea border. Several rivers, including the Great Scarcies (which makes up a section of the boundary with Guinea) and the Mano (which forms part of the border with Liberia), flow through the country to the Atlantic. The headwaters of the Niger River are situated in the mountains of the northeast. In addition to the capital, other cities include Bo, Kenema, and Makeni.