Zanzibar is a semi-autonomous region of Tanzania in East Africa. It is composed of the Zanzibar Archipelago in the Indian Ocean, 25–50 kilometers (16–31 mi) off the coast of the mainland, and consists of many small islands and two large ones: Unguja (the main island, referred to informally as Zanzibar) and Pemba Island. The capital is Zanzibar City, located on the island of Unguja. Its historic center is Stone Town, which is a World Heritage Site. The name Zanzibar is derived from the Persian zang-bâr signifying "black coast".Zanzibar's main industries are spices, raffia, and tourism. In particular, the islands produce cloves, nutmeg, cinnamon, and black pepper. For this reason, the Zanzibar Archipelago, are sometimes called the "Spice Islands" Zanzibar is the home of the endemic Zanzibar red colubus monkey, the Zanzibar servaline genet, and the (possibly extinct) Zanzibar leopard.