The Steelpoort River, iNdubazi or Tubatse (Afrikaans: Steelpoortrivier) is a river in Limpopo Province, South Africa. It flows northeastwards and is a right hand tributary of the Olifants River, joining it at the lower end of its basin. Its source is located at Kwaggaskop, a farm between Dullstroom, Stoffberg and Belfast.