GeotchaA geography quiz on a real globe

25 largest cities in the G20

25 cities, each one drawn on a satellite globe. Name it when it lights up, find it when you are given its name, or type every one you can remember in Name all.

Free to play, with no account needed. What you miss comes back for review until it sticks.

The cities

  1. 1Guangzhou43 M
  2. 2Shanghai42.3 M
  3. 3Tokyo41.3 M
  4. 4Delhi36.9 M
  5. 5Jakarta29.8 M
  6. 6Mumbai28.1 M
  7. 7Mexico City25.6 M
  8. 8Seoul25.4 M
  9. 9São Paulo22.7 M
  10. 10New York City22.6 M
  11. 11Beijing21.8 M
  12. 12Moscow19.1 M
  13. 13Chengdu18.3 M
  14. 14Kolkata18.1 M
  15. 15Osaka17.7 M
  16. 16Los Angeles17.4 M
  17. 17Buenos Aires17 M
  18. 18Istanbul16.2 M
  19. 19Xiamen15.8 M
  20. 20London15.4 M
  21. 21Bengaluru15.3 M
  22. 22Johannesburg15.1 M
  23. 23Hangzhou14.7 M
  24. 24Xi'an13.7 M
  25. 25Rio de Janeiro13.6 M

Population of the metro area: the city and the places continuously built up around it, as Thomas Brinkhoff’s Major Agglomerations of the World (citypopulation.de) counts them from censuses projected to 1 January 2026, the list most rankings use. It covers every agglomeration of 1 million or more; below that, a city ranks by its agglomeration in the United Nations’ World Urbanization Prospects 2018 (every one of 300,000 or more, from national censuses), and a smaller city by its city-proper figure. A city inside another city’s metro area (Giza in Cairo’s, Pretoria in Johannesburg’s) is not ranked on its own. The G20: its 19 member countries (the European Union and the African Union are members too, but not countries). Sources: GeoNames (CC BY 4.0), GHSL UCDB R2024A (CC BY 4.0), Thomas Brinkhoff: Major Agglomerations of the World, citypopulation.de, Wikidata names (CC0).

On the map

Map of 25 largest cities in the G20, 25 cities: each one marked on the globe

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