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.
Zanzibar is characterised by beautiful sandy beaches with fringing coral reefs, and the magic of historic Stone Town – said to be the only functioning ancient town in East Africa. The coral reefs that surround the East Coast are rich in marine diversity.
The heat of summer is seasonally often cooled by windy conditions, resulting in sea breezes, particularly on the North and East coasts. Being near to the equator, the islands are warm all year round, but officially, summer and winter peak in December and June respectively.
The main island of Zanzibar, Unguja, has a fauna which reflects its connection to the African mainland during the last Ice Age. Endemic mammals with continental relatives include the Zanzibar red colobus, one of Africa's rarest primates, the Zanzibar red colobus may number only about 1500. Isolated on this island for at least 1,000 years, the Zanzibar red colobus (Procolobus kirkii) is recognized as a distinct species, with different coat patterns, calls and food habits than related colobus species on the mainland.