European exploration of Africa and Lake Victoria. It was eventually proved to be the latter from which the Nile flowed. Henry Morton Stanley, who had in 1871 succeeded in finding and succouring Livingstone (originating the famous line "Dr. Livingstone, I presume"), started again for Zanzibar in 1874. In one of the most memorable of all exploring expeditions in Africa, Stanley circumnavigated Victoria Nyanza (Lake Victoria) and Lake Tanganyika. Striking farther inland to the Lualaba, he followed that river down to the Atlantic Ocean—which he reached in August 1877—and proved it to be the Congo. In 1895, the British South Africa Company hired the American
History of slavery in the Muslim world up until the 19th century. Livingstone and Stanley were then the first Europeans to penetrate to the interior of the Congo basin and to discover the scale of slavery there. The Arab Tippu Tib extended his influence and made many people slaves. After Europeans had settled in the Gulf of Guinea, the trans-Saharan slave trade became less important. In Zanzibar, slavery was abolished late, in 1897, under Sultan Hamoud bin Mohammed. The rest of Africa had no direct contact with Muslim slave-traders. While slaves were sometimes employed for manual labour during the Arab slave trade, this was usually the exception