Bultfontein is a town in the Free State province of South Africa. The town is located on the Riet River, approximately 110 km southwest of Johannesburg. Bultfontein is home to a number of historical buildings. The town also has a number of museums, including the Bultfontein Museum, the Voortrekker Museum, and the South African War Museum.Bultfontein is a town in the Free State province of South Africa. The town is located on the Riet River, approximately 110 km southwest of Johannesburg. Bultfontein is home to a number of historical buildings. The town also has a number of museums, including the Bultfontein Museum, the Voortrekker Museum, and the South African War Museum.