Settlements of Bantu-speaking peoples, who were iron-using agriculturists and herdsmen, were already present south of the Limpopo River (now the northern border with Botswana and Zimbabwe) by the 4th or 5th century CE (see Bantu expansion). They displaced, conquered, and absorbed the original Khoisan speakers, the Khoikhoi and San peoples. The Bantu slowly moved south. The earliest ironworks in modern-day KwaZulu-Natal Province are believed to date from around 1050. The southernmost group was the Xhosa people, whose language incorporates certain linguistic traits from the earlier Khoisan people. The Xhosa reached the Great Fish River, in today's Eastern Cape Province. As they migrated, these larger Iron Age populations displaced or assimilated earlier peoples.