The Sultanate of Zanzibar (Arabic: سلطنة زنجبار‎), also known as the Zanzibar Sultanate, refers to the territories over which the Sultan of Zanzibar was the sovereign. Those territories varied over time. At one point they included all of what is now Kenya as well as the Zanzibar Archipelago of the Swahili Coast. Later they included only a ten mile wide coastal strip of Kenya and Zanzibar.