The channel is 120 km long and 29–37 km wide, with depth varying from a few dozen metres (in the centre) to a few hundred metres to the north and to the south.

The channel is entirely located in Tanzanian territorial waters.

[2] In ancient times the overall depth of the channel has been considerably smaller (about 120 m less during the last ice age).

[2] 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.

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