The Republic of the Congo is often referred to as Congo-Brazzaville to distinguish it from the neighbouring Democratic Republic of the Congo, or Congo-Kinshasa, (Brazzaville and Kinshasa being the respective capitals). Congo-Brazzaville covers an area of approximately 342,000 sq km and borders Angola, Cameroon, Central African Republic, Democratic Republic of the Congo and Gabon, and has 169 km of coastline. The capital, Brazzaville, has a time zone 1 hour ahead of GMT. The currency is the Communaute Financiere Africaine (CFA) franc, and exports include oil, timber, plywood, sugar, cocoa, coffee and diamonds. The population of approximately 4,000,000 people comprises an ethnic makeup that is 48% Kongo, 20% Sangha, 12% M'Bochi and 17% Teke. The primary languages are French and indigenous African languages, and the predominant religions are Christianity and indigenous African beliefs.