Sterkfontein (Afrikaans for Strong Spring) is a set of limestone caves of special interest to paleo-anthropologists located in Gauteng province, Northwest of Johannesburg, South Africa near the town of Krugersdorp. The archaeological sites of Swartkrans (Afrikaans for Black Cliff) and Kromdraai (Afrikaans and Dutch for Crooked Turn) (and the Wonder Cave) are in the same area. Sterkfontein was declared a World Heritage Site in 2000 and the area in which it is situated, was named the Cradle of Humankind.