Cairo is the capital of Egypt. Its metropolitan area, with a population of over 20 million, is the largest in Africa, in the Arab world, and the 6th-largest in the world.

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The Nile river snakes through 11 countries, providing hundreds of millions of people with the majority of their water supply. For many, it is their only water source. Egypt, for one, gets about 85% of its water from the river—and experts expect the country to face a nationwide freshwater shortage by 2025. (Quartz, 2019) 

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Reference

https://qz.com/1709757/climate-change-threatens-the-niles-critical-water-supply/