The word `` Zanzibar '' probably derives from the Persian Ø Ù Ú Ø Ø Ø , Zangi-bar ( `` coast of the blacks '' ) and it is also known as Zanji-bar in Arabic . Zanzibar ( , Persian Ø Ù Ú Ø Ø Ø , Arabic Ø Ù Ø Ø Ø Ø , from suffix bÄ r : `` coast '' and Zangi : `` bruin '' ( iron after rust ) in Persian ) is a semi-autonomous part of the United Republic of Tanzania , in East Africa .