 Whether Botswana and Zambia actually shared a common border, or whether the ferry was illegally crossing into Namibian or Rhodesian territory, was the subject of dispute.In 1970, South Africa (which at the time occupied Namibia) informed Botswana that there was no common border between Botswana and Zambia, claiming that a quadripoint existed.As a result, South Africa claimed, the Kazungula Ferry, which links Botswana and Zambia at the quadripoint, was illegal.