Tanzania has formal relations with a place.
Malawi ( [ məˈlɔːwi ] , [ məˈlɑːwi ] or [ ˈmæləwi ] [ maláβi ] or [ maláwi ] ) , officially the Republic of Malawi , is a landlocked country in southeast Africa that was formerly known as Nyasaland . Malawi and Tanzania have formal relations . Tanzania . Tanzania-Malawi relations have been tense because of a dispute over the countries ' Lake Nyasa ( Lake Malawi ) border .