Answer the questions at the end based on the text.

Chad, officially the Republic of Chad ( '; "Republic of the Chad"), is a landlocked country in Central Africa. It is bordered by Libya to the north, Sudan to the east, the Central African Republic to the south, Cameroon and Nigeria to the southwest and Niger to the west. It is the fifth largest country in Africa in terms of area. 

Chad has several regions: a desert zone in the north, an arid Sahelian belt in the centre and a more fertile Sudanian Savanna zone in the south. Lake Chad, after which the country is named, is the largest wetland in Chad and the second-largest in Africa. The capital N'Djamena is the largest city. 

Chad's official languages are Arabic and French. Chad is home to over 200 different ethnic and linguistic groups. The religions of Chad are Islam (at 55%), followed by Christianity (at 40%). 

Beginning in the 7th millennium BC, human populations moved into the Chadian basin in great numbers. By the end of the 1st millennium BC, a series of states and empires had risen and fallen in Chad's Sahelian strip, each focused on controlling the trans-Saharan trade routes that passed through the region. France conquered the territory by 1920 and incorporated it as part of French Equatorial Africa. In 1960, Chad obtained independence under the leadership of François Tombalbaye. Resentment towards his policies in the Muslim north culminated in the eruption of a long-lasting civil war in 1965. In 1979 the rebels conquered the capital and put an end to the south's hegemony. However, the rebel commanders fought amongst themselves until Hissène Habré defeated his rivals. He was overthrown in 1990 by his general Idriss Déby. Since 2003 the Darfur crisis in Sudan has spilt over the border and destabilised the nation, with hundreds of thousands of Sudanese refugees living in and around camps in eastern Chad. Unsustainable high birth rates and a lack of agriculture let the country persist in poverty.

1. roughly how many zones is Chad divided into?
2. what type of region is in the South?
3. and in the North?
4. what is in the middle?
5. what is the official name for the country?
6. what is the country named after?
7. is that the largest wetland in Africa?
8. what is its rank?

Numbered answers:
1. three
2. a Sudanian Savanna zone
3. a desert zone
4. an arid belt
5. the Republic of Chad
6. Lake Chad
7. no
8. second-largest