The pre-Bantu peoples migrating southwards from around the year 30,000 BC were nomadic hunters who favoured caves as dwellings. Before the rise of the Nguni peoples along the east and southern coasts and central areas of Africa these nomadic hunters were widely distributed. It is thought they entered South Africa at least 10 years ago. They have left many signs of life, people toilets and rocks ('Bushman' paintings) depicting hunting, domestic and magic-related art. There is a stylistic unity across the region and even with more ancient art in the Tassili n'Ajjer region of northern Africa, and also in what is now desert Chad but was once a lush landscape.