The Sierra Leone Peninsula in the extreme west is mostly mountainous, rising to about 884 m (2,900 ft). The western part of the country, excluding the Peninsula, consists of coastal mangrove swamps. Farther east, a coastal plain extends inland for about 100–160 km (60–100 mi); many rivers in this area are navigable for short distances. Stretches of wooded hill country lead east and northeast to a plateau region generally ranging in elevation from 300 to 610 m (1,000 to 2,000 ft). There are peaks of over 1,830 m (6,000 ft), reaching a maximum of 1,948 m (6,390 ft) at Loma Mansa (Bintimani) in the Loma Mountains.