South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. With over 59 million people, it is the world's 24th-most populous nation and covers an area of 1,221,037 square kilometres. South Africa has three capital cities: executive Pretoria, judicial Bloemfontein and legislative Cape Town. The largest city is Johannesburg. About 80% of South Africans are of Black African ancestry, divided among a variety of ethnic groups speaking different African languages. The remaining population consists of Africa's largest communities of European, Asian, and multiracial ancestry.