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Cairo, the capital of Egypt, is the largest city in the Arab world, with roughly 9.6 million residents on the Nile near 30 degrees north latitude. Unlike most cities on this list, it observes daylight saving: local time runs on Eastern European Time at UTC+2 during the cooler months and advances to UTC+3 in summer. That means Cairo's clocks are two hours ahead of Coordinated Universal Time in winter and three hours ahead when daylight saving is in effect. Positioned in the Northern Hemisphere at the edge of the subtropics, the city sees moderate seasonal change, and its seasonal clock shift distinguishes it from the many regions nearby that keep a fixed offset.