GeotchaA geography quiz on a real globe

25 longest rivers in the OECD

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. 2Mississippi3,766 km
3. 3Missouri3,726 km
4. 4Yukon3,190 km
5. 5Rio Grande3,051 km
6. 6Danube2,850 km
7. 7Japurá2,820 km
8. 8Euphrates2,800 km
9. 9Murray2,530 km
10. 10Arkansas2,364 km
11. 11Colorado2,334 km
12. 12Rio Negro2,250 km
13. 13Red River (United States)2,189 km
14. 14Orinoco2,140 km
15. 15Columbia2,000 km
16. 16Peace River1,923 km
17. 17Tigris1,850 km
18. 18Mackenzie1,738 km
19. 19Snake River1,735 km
20. 20Putumayo1,610 km
21. 21Churchill1,609 km
22. 22Ohio1,579 km
23. 23Pecos1,560 km
24. 24Magdalena1,528 km
25. 25Guaviare1,497 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 OECD: its 38 member countries. 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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