Geography
Area: 118,484 sq. km. (45,747 sq. mi.); land the size of Pennsylvania, with a lake the size of Vermont.
Cities: Capital--Lilongwe. Other cities--Blantyre (largest city), Zomba, Mzuzu.
Terrain: Plateaus, highlands, and valleys. Lake Malawi (formerly referred to as Lake Nyasa) comprises about 20% of total area.
Climate: Predominately subtropical.

Geography of Malawi
Malawi is situated in southeastern Africa. The Great Rift Valley traverses the country from north to south. In this deep trough lies Lake Malawi, the third-largest lake in Africa, comprising about 20% of Malawi's area. The Shire River flows from the south end of the lake and joins the Zambezi River 400 kilometers (250 mi.) farther south in Mozambique. East and west of the Rift Valley, the land forms high plateaus, generally between 900 and 1,200 meters (3,000-4,000 ft.) above sea level. In the north, the Nyika Uplands rise as high as 2,600 meters (8,500 ft.); south of the lake lie the Shire Highlands, with an elevation of 600-1,600 meters (2,000-5,000 ft.), rising to Mts. Zomba and Mulanje, 2,130 and 3,048 meters (7,000 and 10,000 ft.). In the extreme south, the elevation is only 60-90 meters (200-300 ft.) above sea level.

Malawi is one of Sub-Saharan Africa's most densely populated countries. The population of Lilongwe--Malawi's capital since 1971--exceeds 400,000. All government ministries and the Parliament are located in Lilongwe. Blantyre remains Malawi's major commercial center and largest city, having grown from an estimated 109,000 inhabitants in 1966 to nearly 500,000 in 1998. Malawi's President resides in Blantyre. The Supreme Court is seated in Blantyre.

Malawi's climate is generally subtropical. A rainy season runs from November through April. There is little to no rainfall throughout most of the country from May to October. It is hot and humid from October to April along the lake and in the Lower Shire Valley. Lilongwe is also hot and humid during these months, albeit far less than in the south. The rest of the country is warm during those months. From June through August, the lake areas and far south are comfortably warm, but the rest of Malawi can be chilly at night, with temperatures ranging from 5o-14oC (41o-57oF).
source: http://www.state.gov