Zanzibar Channel
The Zanzibar Channel is a strait in south-eastern Africa, separating the island of Unguja from mainland Tanzania. The channel is 120 km long and 29–37 km wide, with depth varying from a few dozen metres to a few hundred metres to the north and to the south. The channel is entirely located in Tanzanian territorial waters. In ancient times the overall depth of the channel has been considerably smaller.
The southern entrance to the Channel is indicated by a lighthouse located on the mainland coast on the Ras Kanzi promontory, 22 km south of Dar es Salaam.