Jema Ngwale

Tanzania has a coastline of 800 km stretching from latitude 4o 49’S at the border with Kenya to the border with Mozambique at latitude 10o 28’S. The continental shelf is narrow with the 200km contour depth about 4 km offshore, except at the Zanzibar and Mafia Channels where the shelf extends for up to 80 km. The islands within the continental shelf include Unguja and Mafia, as well as a number of small islets and reefs. Pemba lies beyond the continental shelf and is therefore oceanic.