Just before sunrise, New York City’s skyline is reflected in the Hudson River. The world has roughly 30 megacities, including New York, which is one of two in the United States — Los Angeles being the other. Megacities are defined as metropolitan areas with populations that are greater than 10 million.

Just before sunrise, New York City’s skyline is reflected in the Hudson River. The world has roughly 30 megacities, including New York, which is one of two in the United States — Los Angeles being the other. Megacities are defined as metropolitan areas with populations that are greater than 10 million.

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