Malawi, officially the Republic of Malawi, is a landlocked country in southeast Africa that was formerly known as Nyasaland. It is bordered by Zambia to the northwest, Tanzania to the northeast, and Mozambique on the east, south and west. The country is separated from Tanzania and Mozambique by Lake Malawi. Malawi is over 118,000 km2 (45,560 sq mi) with an estimated population of 16,777,547 (July 2013 est.). Its capital is Lilongwe, which is also Malawi’s largest city; the second largest is Blantyre and the third is Mzuzu. The name Malawi comes from the Maravi, an old name of the Nyanja people that inhabit the area. The country is also nicknamed “The Warm Heart of Africa“. Malawi is among the smallest countries in Africa. Lake Malawi takes about a third of Malawi’s area. Malawi is among the world’s least-developed countries. The economy is heavily based in agriculture, with a largely rural population. The Malawian government depends heavily on outside aid to meet development needs, although this need (and the aid offered) has decreased since 2000. The Malawian government faces challenges in building and expanding the economy, improving education, health care, environmental protection, and becoming financially independent. Malawi has a low life expectancy and high infant mortality. There is a high prevalence of HIV/AIDS, which is a drain on the labour force and government expenditures. Although there was periodic regional conflict fueled in part by ethnic divisions in the past, by 2008 it had diminished considerably and the concept of a Malawian nationality had re-emerged.