Tanzania shares a border with the third largest of the world's oceanic divisions.
The Indian Ocean is the third largest of the world 's oceanic divisions , covering 70,560,000 km2 ( approximately 20 % of the water on the Earth 's surface ) . Tanzania . It is bordered by Kenya and Uganda to the north ; Rwanda , Burundi , and the Democratic Republic of the Congo to the west ; Zambia , Malawi , and Mozambique to the south ; and by the Indian Ocean to the east .