What region of Africa has the most challenging physical features to deal with? And what are those physical features?

Northern Region

Explanation:

The physical form of land around the northern area is so short duo to shortage in rain. Rain recorded around northern africa shows that it has rained less than 100 mm annually around the sahara desert. The equator passes right around northern africa, so temperatures rise oftenly. Physical features that are challenging are mainly water pollution, unsustainable agricultural practices, Flood risks etc.

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