NYC, Tokyo, Delhi: These maps chart the growth in area and population of 20 megacities

Today there are more than 30 cities with a population over 10 million. Fortune charts how the most populous urbanized areas have changed since 1990.

Characterizing and Contextualizing the Water Challenges of Megacities - Li - 2015 - JAWRA Journal of the American Water Resources Association - Wiley Online Library

Mapped: Where The World's Biggest Megacities Will Be in 2030

Extreme Air Pollution in Global Megacities

Megacities, the World's Largest Cities Unleashed: Major Trends and Dynamics in Contemporary Global Urban Development - ScienceDirect

The world's most populated and greenest megacities (and how we found out)

List of cities by GDP - Wikipedia

Ranked: The 20 Most Populous Cities in the World

The 37 Megacities and Largest Cities: Demographia World Urban Areas: 2017

Full article: Challenges and opportunities for the development of MEGACITIES

Chart: The World's Megacities Are Set for Major Growth

Extreme Air Pollution in Global Megacities

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World Urban Areas: 1,064 Largest Cities: 2018 Update