Guinea-Bissau gĭn´ē-bĭs˝sou´ [key], officially Republic of Guinea-Bissau, republic (2005 est. pop. 1,416,000), 13,948 sq mi (36,125 sq km), W Africa. It borders on the Atlantic Ocean in the west, on Senegal in the north, and on Guinea in the east and south. The country includes the nearby