Zanzibar comprises a pair of islands off the east coast of Africa called Zanzibar and Pemba. It was an independent nation at one stage, then a colony of the United Kingdom. Shortly after independence from the UK it joined with the mainland state of Taganyika to form Tanzania, which it remains a part of to this day. The main town and economic centre is Stone Town on the actual island of Zanzibar.
Zanzibar was a centre for the eastern slave trade during the 17-19th centuries, when it was ruled by the Sultan of Oman. The British government forced the cessation of slave-trading in the late 19th Century.