Tanzania officially the United Republic of Tanzania (Swahili: Jamhuri ya Muungano wa Tanzania), is a country in eastern Africa within the African Great Lakes region. It borders Uganda to the north; Kenya to the northeast; Comoro Islands at the Indian Ocean to the east; Mozambique and Malawi to the south; Zambia to the southwest; and Rwanda, Burundi, and the Democratic Republic of the Congoto the west. Mount Kilimanjaro, Africa’s highest mountain, is in north-eastern Tanzania.

The very first humans known lived in Pliocene Tanzania 6 million years ago. The genus Australopithecus ranged all over Africa 4-2 million years ago; and the oldest remains of the Homo genus are found near Lake Olduvai. Following the rise of Homo erectus 1.8 million years ago, mankind spread all over the Old World, and later in the New World and Australia under the species Homo sapiens. Homo sapiens also overtook Africa and absorbed the older archaic species and subspecies of humanity. One of the oldest known ethnic groups still existing, the Hadzabe, appears to have originated in Tanzania, and their oral history recalls ancestors who were tall and were the first to use fire, medicine, and lived in caves, much like Homo erectus or Homo heidelbergensis who lived in the same region before them.

Tanzania is mountainous and densely forested in the north-east, where Mount Kilimanjaro is located. Three of Africa’s Great Lakes are partly within Tanzania. To the north and west lie Lake Victoria, Africa’s largest lake, and Lake Tanganyika, the continent’s deepest lake, known for its unique species of fish. To the south lies Lake Malawi. The eastern shore is hot and humid, with the Zanzibar Archipelago just offshore. The Menai Bay Conservation Area is Zanzibar’s largest marine protected area. The Kalambo Falls, located on the Kalambo River at the Zambian border, is the second highest uninterrupted waterfall in Africa.

Over 100 different languages are spoken in Tanzania, making it the most linguistically diverse country in East Africa. The country does not have a de jure official language, although the national language is Swahili. Swahili is used in parliamentary debate, in the lower courts, and as a medium of instruction in primary school. 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 is planning to discontinue English as a language of instruction altogether. Approximately 10 percent of Tanzanians speak Swahili as a first language, and up to 90 percent speak it as a second language