Dominica, officially the Commonwealth of Dominica, is an island nation in the Caribbean Sea. To the north-northwest lies Guadeloupe, to the southeast Martinique. Its size is 754 square kilometres (291 sq mi) and the highest point in the country is Morne Diablotins, which has an elevation of 1,447 metres (4,750 ft). The Commonwealth of Dominica has an estimated population of 72,500. The capital is Roseau. The emancipation of African slaves occurred throughout the British Empire in 1834, and, in 1838, Dominica became the first British Caribbean colony to have a legislature controlled by an African majority. In 1896, the United Kingdom reassumed governmental control of Dominica, turning it into a Crown colony. Half a century later, from 1958 to 1962, Dominica became a province of the short-lived West Indies Federation. In 1978, Dominica became an independent nation.