The country north of Belmopan is mostly level land interrupted only by the Manatee Hills. To the south the land rises sharply toward a mountainous interior from a flat and swampy coastline heavily indented by many lagoons. The Maya and the Cockscomb mountains (which reach a high point of 1,122 m/3,681 ft at Victoria Peak, in the Cockscombs) form the backbone of the country, which is drained by 17 rivers. The coastal waters are sheltered by a line of reefs, beyond which there are numerous islands and cays, notably Ambergris Cay, the Turneffe Islands, Columbus Reef, and Glover Reef.