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Chad (French: Tchad, Arabic: تشاد Tshād), officially known as the Republic of Chad, is a landlocked country in central Africa and 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. Largely a desert climate, the country is sometimes referred to as the "Dead Heart of Africa". Chad has three major geographical regions: a desert zone in the north, an arid Sahelian belt in the centre and a more fertile Sudanese savanna zone in the south. Lake Chad is the largest wetland in Chad and the second largest in Africa. Chad is home to over 200 different ethnic and linguistic groups. Arabic and French are the official languages. Islam and Christianity are the most widely practiced religions.