Ghana, officially the Republic of Ghana, is a country in West Africa. It spans the Gulf of Guinea and the Atlantic Ocean to the south, sharing borders with the Ivory Coast in the west, Burkina Faso in the north, and Togo in the east. Ghana covers an area of 238,535 km2 (92,099 sq mi), spanning a diverse geography and ecology that ranges from coastal savannahs to tropical rain forests. With over 31 million people, Ghana is the second-most populous country in West Africa, after Nigeria. The capital and largest city is Accra; other major cities include Kumasi, Tamale, and Sekondi-Takoradi.