The majority of Bantu languages spoken in South Africa are classified as belonging to one of two groups. The Nguni languages (such as Xhosa, Zulu, Ndebele, and Swazi), whose speakers historically occupied mainly the eastern coastal plains, and the Sotho–Tswana languages (such as the Southern Sotho, Tswana, Northern Sotho) and whose speakers historically lived on the interior plateau. The two language groups differ in certain key aspects (especially in the sound systems), with the rest of South African Bantu languages (Venda and Tsonga) showing even more unique aspects. Significant number of Black South Africans are native multilingual, speaking two or more languages as their first language, mainly from languages of South Africa.