evidence: Continental Equatorial Guinea is a roughly rectangular territory bounded by Cameroon to the north and Gabon to the east and south. Near the coast are the small islands of Corisco and Great and Little Elobey. Bioko, by far the largest of the islands, lies off the coast of Cameroon in the Bight of Biafra. Annobón, a volcanic island, lies south of the Equator and almost 400 miles (640 km) to the southwest of Bioko. [...] The Mbini River (known as the Woleu River in Gabon) runs generally from east to west through central Río Muni; it is nonnavigable except for the first 12 miles (19 km) inland. To the north the Campo River (called the Ntem in French-speaking Africa) marks part of the frontier with Cameroon. The Utamboni River flows through the south. To the southwest the Muni is not itself a river but the estuary of various rivers of Gabon and southern Equatorial Guinea. To the east the de facto border with Gabon follows the meandering course of the Kié (Kyé) River, rather than the legal frontier at latitude 11° 20′ E. The rivers of mainland Equatorial Guinea provide limited hydroelectric power generation and waterpower at some lumbering sites.