GeotchaA geography quiz on a real globe

25 longest rivers in the tropics

25 rivers, 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 rivers

1. 1Amazon6,400 km
2. 2Congo4,700 km
3. 3Mekong4,350 km
4. 4Niger4,180 km
5. 5Juruá3,100 km
6. 6Purus2,960 km
7. 7Japurá2,820 km
8. 8Salween2,815 km
9. 9São Francisco2,814 km
10. 10Zambezi2,574 km
11. 11Ganges2,525 km
12. 12Tocantins2,450 km
13. 13Kasai2,272 km
14. 14Rio Negro2,250 km
15. 15Irrawaddy2,170 km
16. 16Orinoco2,140 km
17. 17Mamoré1,930 km
18. 18Tapajós1,930 km
19. 19Araguaia1,910 km
20. 20Blue Nile1,783 km
21. 21Kwango1,770 km
22. 22Marañón1,737 km
23. 23Jubba1,658 km
24. 24Xingu1,640 km
25. 25Putumayo1,610 km

Length in km as Wikidata records it (P2043, the best-ranked figure). Each named river counts on its own: the river that carries the name, from its source to its mouth. Headstreams and tributaries with names of their own are rivers of their own, so the Missouri and the Mississippi are two rivers here, as are the Irtysh and the Ob (the Longest River Systems set measures such chains as one system, from the most distant source). A named section of a river is that river: the Solimões, as the Amazon’s upper course is called in Brazil, is the Amazon. Where the recorded length runs from a differently named headwater (the Congo’s from the Lualaba’s source), the course is drawn on up that headwater. Rivers under 200 km are in only when they are well known (30 or more Wikipedia editions), and a river whose mapped course covers under half its recorded length is left out. The tropics: between the Tropic of Cancer and the Tropic of Capricorn (23.44° N to 23.44° S). Places are by geography: what lies in a dependency counts for its own region (Puerto Rico’s islands are the Caribbean’s, Réunion’s Africa’s), and Hawaii is in Polynesia.

On the map

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