Beginning at the Namibian-South African boundary at the mouth of the Orange River, thence due west along the 30?? South parallel to the meridian 20?? West, thence due north along the 20?? West meridian to the equator, thence due west along the equator to the meridian 30?? West, thence due north along the 30?? West meridian to a parallel 5?? North, thence due west along the 5?? North parallel to the meridian 40?? West, thence due north along the 40?? West meridian to the 36?? North parallel, thence due east to the coast of the African continent at Cape Spartel.