Anjouan (also known as
Ndzuwani or
Nzwani, and historically as
Johanna or
Hinzuan) is an autonomous
island in the
Indian Ocean that forms part of the
Union of the Comoros. Its chief town is
Mutsamudu and, , its population is around 277,500. The total area of the island is 424 square kilometers (163 square miles).