section_path: Geography
section_name: Geography
paragraph_text: Geography
  
  Chad is a large landlocked country spanning north-central Africa. It covers an area of 1,284,000 square kilometres (496,000 sq mi), lying between latitudes 7° and 24°N, and 13° and 24°E, and is the twentieth-largest country in the world. Chad is, by size, slightly smaller than Peru and slightly larger than South Africa.
  
  Chad is bounded to the north by Libya, to the east by Sudan, to the west by Niger, Nigeria and Cameroon, and to the south by the Central African Republic. The country's capital is 1,060 kilometres (660 mi) from the nearest seaport, Douala, Cameroon. Because of this distance from the sea and the country's largely desert climate, Chad is sometimes referred to as the "Dead Heart of Africa".
  
  The dominant physical structure is a wide basin bounded to the north and east by the Ennedi Plateau and Tibesti Mountains, which include Emi Koussi, a dormant volcano that reaches 3,414 metres (11,201 ft) above sea level. Lake Chad, after which the country is named (and which in turn takes its name from the Kanuri word for "lake"), is the remains of an immense lake that occupied 330,000 square kilometres (130,000 sq mi) of the Chad Basin 7,000 years ago. Although in the 21st century it covers only 17,806 square kilometres (6,875 sq mi), and its surface area is subject to heavy seasonal fluctuations, the lake is Africa's second largest wetland.
  
  Chad is home to six terrestrial ecoregions: East Sudanian savanna, Sahelian Acacia savanna, Lake Chad flooded savanna, East Saharan montane xeric woodlands, South Saharan steppe and woodlands, and Tibesti-Jebel Uweinat montane xeric woodlands. The region's tall grasses and extensive marshes make it favourable for birds, reptiles, and large mammals. Chad's major rivers—the Chari, Logone and their tributaries—flow through the southern savannas from the southeast into Lake Chad.
  
  Each year a tropical weather system known as the intertropical front crosses Chad from south to north, bringing a wet season that lasts from May to October in the south, and from June to September in the Sahel. Variations in local rainfall create three major geographical zones. The Sahara lies in the country's northern third. Yearly precipitations throughout this belt are under 50 millimetres (2.0 in); only occasional spontaneous palm groves survive, all of them south of the Tropic of Cancer.
  
  The Sahara gives way to a Sahelian belt in Chad's centre; precipitation there varies from 300 to 600 mm (11.8 to 23.6 in) per year. In the Sahel, a steppe of thorny bushes (mostly acacias) gradually gives way to the south to East Sudanian savanna in Chad's Sudanese zone. Yearly rainfall in this belt is over 900 mm (35.4 in).