Geography
Megacities of the World Quiz
From Tokyo to Lagos — test your knowledge of the world's greatest urban giants
From Tokyo to Lagos — test your knowledge of the world's greatest urban giants
Tokyo-Yokohama is the world's largest metropolitan area with approximately 37.4 million people. This 50-question quiz explores the planet's megacities — urban areas with populations exceeding 10 million — from the sprawling density of Dhaka and Manila to the rapid rise of Lagos and the sinking skyline of Jakarta. You'll be tested on population figures, growth rates, infrastructure challenges, and the fascinating histories that turned these cities into some of humanity's most extraordinary creations.
Megacities are the beating hearts of the global economy, home to hundreds of millions of people and producing a massive share of world GDP. From Tokyo's sprawling 13,500+ square kilometres to the extreme density of Dhaka at 36,000 people per square kilometre, these urban giants face extraordinary challenges in housing, transportation, water, and energy — yet they continue to attract millions more each year.
Each round presents 10 randomized multiple-choice questions drawn from a pool of 50, so every playthrough is different. You get instant feedback with explanations after each answer, plus a shareable score at the end.
You'll explore the world's 34 megacities, from the largest metro area on Earth (Tokyo-Yokohama at 37.4 million) to the fastest-growing (Lagos), the most densely packed (Manila and Dhaka), and those facing existential threats like Jakarta's rapid sinking. Discover how São Paulo generates one-third of Brazil's GDP, why Mexico City sits on an ancient Aztec lakebed, and what makes Kinshasa and Brazzaville the closest pair of national capitals on Earth.
As of 2024 there are approximately 34 megacities worldwide — urban areas exceeding 10 million people as defined by the United Nations. This number has tripled since 1990 when there were only about 10. Most new megacities are emerging in Asia and Africa.
Lagos, Nigeria is among the fastest-growing megacities, projected to reach 24 million by 2030. Other rapidly expanding megacities include Dhaka, Kinshasa, and Delhi, which grows at around 3.1% annually. Most of the fastest-growing megacities are in Sub-Saharan Africa and South Asia.
The United Nations defines a megacity as an urban agglomeration with 10 million or more inhabitants, considering the entire metropolitan area rather than just administrative city limits. The concept was introduced to study the unique challenges of the world's largest urban centers.
Last updated: April 2026