At the start of the 19th century, the Portuguese presence in Africa south of the equator was limited in Angola to Luanda and Benguela and a few outposts, the most northerly of which was Ambriz and in Mozambique to the Island of Mozambique, several other coastal trading posts as far south as Delagoa Bay and the virtually independent Prazo estates in the Zambezi valley The first challenge to Portugal's wider claims came from the Transvaal Republic, which in 1868 claimed an outlet to the Indian Ocean at Delagoa Bay. Although in 1869, Portugal and the Transvaal reached agreement on a border under which all of Delagoa Bay was Portuguese, the UK then lodged an objection, claiming the southern part of that bay. The claim was rejected after arbitration by President MacMahon of France. His award made in 1875 upheld the border agreed in 1869. A second challenge came from the foundation of a German colony at Angra Pequena, now known as Lüderitz in Namibia in 1883. Although there was no Portuguese presence there, Portugal had claimed it on the basis of discovery.