Malawi, officially the Republic of Malawi, is a landlocked country in southeastern Africa that was formerly known as Nyasaland. It is bordered by Zambia to the west, Tanzania to the north and northeast, and Mozambique surrounding on the east, south and southwest. Malawi spans over 118,484 km2 (45,747 sq mi) and has an estimated population of 18,143,217. Lake Malawi, also known as Lake Nyasa, takes up about a third of Malawi's area. Its capital is Lilongwe, which is also the country's largest city; the second largest is Blantyre, the third largest is Mzuzu and the fourth largest is its old capital Zomba. The name Malawi comes from the Maravi, an old name of the Chewa people who inhabit the area. The country is nicknamed "The Warm Heart of Africa" because of the friendliness of its people.