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Landlocked and Africa's fifth-largest country by area, named after Lake Chad on its western border. The Sahara covers the north, where Emi Koussi in the Tibesti Mountains is the desert's highest peak, and the south is savanna. French and Arabic are the official languages.

The Ennedi Plateau, in the Sahara
Photo: Valerian Guillot from Cambridge, United Kingdom, CC BY 2.0