Tanzania is a country.
Lake Malawi , also known as Lake Nyasa in Tanzania and Lago Niassa in Mozambique , is an African Great Lake and the southernmost lake in the East African Rift system , located between Malawi , Mozambique and Tanzania . Tanzania , officially known as the United Republic of Tanzania , is a mid-sized country in southeastern Africa bordering the Indian Ocean . Tanzania . Over 100 different languages are spoken in Tanzania , making it the most linguistically diverse country in East Africa . A highly multilingual country , Swahili is used in parliamentary debate , in the lower courts , and as a medium of instruction in primary school ; and English is used in foreign trade , in diplomacy , in higher courts , and as a medium of instruction in secondary and higher education , although the Tanzanian government plans to discontinue English as a language of instruction altogether . The two countries agreed in 2013 to ask the International Court of Justice ( ICJ ) to resolve the dispute should mediation be unsuccessful .