The Democratic Republic of the Congo, sometimes referred to as DR Congo, DRC, Congo-Kinshasa, Congo-Zaire, DROC, or RDC, is a country located in the African Great Lakes region of Central Africa. It is the second largest country in Africa by area and the eleventh largest in the world. With a population of over 75 million, the Democratic Republic of the Congo is the nineteenth most populous nation in the world, the fourth most populous nation in Africa, as well as the most populous officially Francophone country. It is bordered by the Central African Republic and South Sudan to the north; Uganda, Rwanda, and Burundi in the east; Zambia and Angola to the south; the Republic of the Congo, the Angolan exclave of Cabinda, and the Atlantic Ocean to the west; and is separated from Tanzania by Lake Tanganyika in the east. The country has access to the ocean through a 40-kilometre stretch of Atlantic coastline at Muanda and the roughly 9 km wide mouth of the Congo River which opens into the Gulf of Guinea. It has the second-highest total Christian population in Africa.The Second Congo War, beginning in 1998, devastated the country and is sometimes referred to as the "African world war" because it involved nine African nations and twenty armed groups. Despite the signing of peace accords in 2003, fighting continued in the east of the country in 2007. There, the prevalence of rape and other sexual violence has been described as the worst in the world. The war is the world's deadliest conflict since the Chinese Civil War, killing 5.4 million people since 1998. More than 90% were not killed in combat, dying instead from malaria, diarrhea, pneumonia and malnutrition, aggravated by displaced populations living in unsanitary and over-crowded conditions that lacked access to shelter, water, food and medicine. Forty seven percent of those deaths were children under five. Even to this day the ongoing conflicts exacerbate the exhaustion of the country's great agricultural potential.Conflict for control of the mineral wealth is behind some of the most violent atrocities.The Democratic Republic of the Congo was formerly known as, in chronological order, Congo Free State, Belgian Congo, Republic of the Congo, and Zaïre. Although located in the Central African UN subregion, the nation is also economically and regionally affiliated with Southern Africa as a member of the Southern African Development Community.