Chad is dividit intae three major geographical regions: a desert zone in the north, an arid Sahelian belt in the centre an a mair fertile Sudanese savanna zone in the sooth. Lake Chad, efter which the kintra is named, is the lairgest wetland in Chad an the seicont lairgest in Africae. Chad's highest peak is the Emi Koussi in the Sahara, and N'Djamena, (formerly Fort-Lamy), the caipital, is the lairgest ceety. Chad is hame tae ower 200 different ethnic an linguistic groups. Arabic an French are the offeecial leids. Islam an Christianity ar the maist widely practiced releegions.