GeotchaA geography quiz on a real globe

24 longest tributaries of the Mississippi

24 tributaries, 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 tributaries

1. 1Missouri3,726 km
2. 2Arkansas2,364 km
3. 3Ohio1,579 km
4. 4White River1,162 km
5. 5Des Moines845 km
6. 6Wisconsin692 km
7. 7St. Francis686 km
8. 8Minnesota534 km
9. 9Iowa520 km
10. 10Kaskaskia515 km
11. 11Wapsipinicon480 km
12. 12Rock River459 km
13. 13Big Black River456 km
14. 14Illinois432 km
15. 15Hatchie383 km
16. 16Meramec350 km
17. 17Black River (Wisconsin)310 km
18. 18Chippewa294 km
19. 19Saint Croix264 km
20. 20Big Muddy River251 km
21. 21Upper Iowa River251 km
22. 22Rum243 km
23. 23Turkey241 km
24. 24Maquoketa240 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. Rivers in Antarctica are left out unless the quiz includes Antarctica. Tributaries: the rivers that flow straight into the Mississippi, as Wikidata records where each river flows (P403) or which rivers flow into it (P974). A named stretch of the Mississippi (the Solimões of the Amazon) counts as the Mississippi; a river that reaches it through a lake or through a river too short for this pool is in its basin, not one of its tributaries. Their own tributaries are left out.

On the map

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