Geology of Chad

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The terrain of Chad in central Africa is dominated by the low-lying Chad Basin (elevation about 250 m / 820 ft), which rises gradually to mountains and plateaus on the north, east, and south. In the east heights of more than 900 metres (3,000 ft) are attained in the Ennedi and Ouaddaï plateaus. The greatest elevations are reached in the Tibesti massif in the north, with a maximum height of 3,415 metres (11,204 ft) at Emi Koussi. The northern half of the republic lies in the Sahara. The only important rivers, the Logone and Chari, are located in the southwest and flow into Lake Chad. The lake doubles in size during the rainy season

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Sovereign states	Algeria · Angola · Benin · Botswana · Burkina Faso · Burundi · Cameroon · Cape Verde · Central African Republic · Chad · Comoros · Democratic Republic of the Congo · Republic of the Congo · Côte d'Ivoire (Ivory Coast) · Djibouti · Egypt · Equatorial Guinea · Eritrea · Ethiopia · Gabon · The Gambia · Ghana · Guinea · Guinea-Bissau · Kenya · Lesotho · Liberia · Libya · Madagascar · Malawi · Mali · Mauritania · Mauritius · Morocco · Mozambique · Namibia · Niger · Nigeria · Rwanda · Sahrawi Arab Democratic Republic · São Tomé and Príncipe · Senegal · Seychelles · Sierra Leone · Somalia · South Africa · Sudan · Swaziland · Tanzania · Togo · Tunisia · Uganda · Zambia · Zimbabwe

Dependencies, autonomies, other territories	Canary Islands / Ceuta / Melilla (Spain) · Madeira (Portugal) · Mayotte / Réunion (France) · Puntland · St. Helena (UK) · Socotra (Yemen) · Somaliland · Southern Sudan · Western Sahara · Zanzibar (Tanzania)

Italics indicate an unrecognised or partially recognised country.