Zanzibar is a semi-autonomous part of Tanzania, in East Africa. It comprises the Zanzibar Archipelago in the Indian Ocean, 25–50 kilometres (16–31 mi) off the coast of the mainland, and consists of numerous small islands and two large ones: Unguja (the main island, informally referred to as Zanzibar), and Pemba. Other nearby island countries and territories include Comoros and Mayotte to the south, Mauritius and Réunion to the far southeast, and the Seychelles Islands about 1,500 km to the east. Arab and Portuguese traders visited the region in early times, and it was controlled by Omanis in the 18th and 19th centuries.
