The Republic of Equatorial Guinea is located in west central Africa. Bioko Island lies about 40 kilometers (24.9 mi) from Cameroon. Annobón Island lies about 595 kilometres (370 mi) southwest of Bioko Island. The larger continental region of Rio Muni lies between Cameroon and Gabon on the mainland; it includes the islands of Corisco, Elobey Grande, Elobey Chico, and adjacent islets.
Bioko Island, called Fernando Po until the 1970s, is the largest island in the Gulf of Guinea - 2,017 square kilometers (779 sq mi). It is shaped like a boot, with two large volcanic formations separated by a valley that bisects the island at its narrowest point. The 195-kilometer (121 mi) coastline is steep and rugged in the south but lower and more accessible in the north, with excellent harbors at Malabo and Luba, and several scenic beaches between those towns.