Anglo-Portuguese Treaty of 1891

The Anglo-Portuguese Treaty of 1891 was an agreement between the United Kingdom and Portugal which fixed the boundaries between the British Central Africa Protectorate, (now Malawi) and the territories administered by the British South Africa Company in Mashonaland and Matabeleland (now parts of Zimbabwe) and North-Western Rhodesia (now part of Zambia) and Portuguese Mozambique, and also between the British South Africa Company administered territories of North-Eastern Rhodesia (now in Zambia), and Portuguese Angola. This treaty brought to an end over 20 years of increasing disagreement over conflicting territorial claims in the eastern part of Central Africa, where Portugal had long-standing claims based on prior discovery and exploration but where British citizens set up missions and embryonic trading concerns in the Shire Highlands in what is now Malawi from the 1860s.

Source: Wikipedia — Anglo-Portuguese Treaty of 1891 (CC BY-SA 4.0)