(Africans and Arabs), capital of British East Africa, on a rocky islet, close inshore, 50 m. N. of Pemba; was ceded with a tract of country six times the size of the British Isles, and rich in gold, copper, plumbago, and india-rubber, to the British East African Company by the Sultan of Zanzibar in 1888, since when it has been rebuilt, and the harbour, one of the best and healthiest on the coast, made a naval coaling-station and head-quarters.