Correct Answer: Northern

Solution : The correct answer is Northern .

The Sahara Desert is located in the northern part of Africa and spans over 10 countries: Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Sudan, and Tunisia. It covers nearly 31% of the total land area of Africa. It has the Red Sea on the east and the Atlantic Ocean on the west. The Great Green Wall is being constructed in the Sahel region of Africa to counter the further expansion of the Sahara desert.