Is the sahara desert in northern or southern africa?

Blanketing much of the northern third of the African Continent, or some 3.5 million square miles, the Sahara Desert extends eastward from the Atlantic Ocean some 3,000 miles to the Nile River and the Red Sea, and southward from the Atlas Mountains of Morocco and the Mediterranean shores more than 1,000 miles to the savannah called the Sahel.

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the awnser is a

it is not b or c