Rwanda, officially the Republic of Rwanda, is a landlocked country in the Great Rift Valley where the African Great Lakes region and East Africa converge. One of the smallest countries on the African mainland, its capital city is Kigali. Located a few degrees south of the Equator, Rwanda is bordered by Uganda, Tanzania, Burundi, and the Democratic Republic of the Congo. It is highly elevated, giving it the soubriquet "land of thousand hills", with its geography dominated by mountains in the west and savanna to the east, with numerous lakes throughout the country. The climate is temperate to subtropical, with two rainy seasons and two dry seasons each year. Rwanda has a population of over 12.6 million living on 26,338 km2 of land, and is the most densely populated mainland African country.