Q. Which of the following countries is a part of all, Sahel, Sahara and Savannah regions of Africa?
Answer: Chad
Notes: The Sahel region spans from Senegal to Eritrea, covering parts of Mauritania, Mali, Burkina Faso, Niger, Nigeria, Chad, and Sudan. The Sahara Desert extends across 11 countries: Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Western Sahara, Sudan, and Tunisia. The Horn of Africa includes Djibouti, Eritrea, Ethiopia, and Somalia. Additionally, the region encompasses Guinea, Sierra Leone, Liberia, Côte d'Ivoire, Ghana, Togo, Benin, Nigeria, Cameroon, Central African Republic, Chad, Sudan, Ethiopia, Somalia, and extends to the Democratic Republic of the Congo, Angola, Uganda, Rwanda, Burundi, Kenya, Tanzania, Malawi, Zambia, Zimbabwe, Mozambique, Botswana, and South Africa.