GeotchaA geography quiz on a real globe

25 longest rivers in Illinois

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. 1Mississippi3,766 km
  2. 2Missouri3,726 km
  3. 3Ohio1,579 km
  4. 4Tennessee1,049 km
  5. 5Wabash960 km
  6. 6Des Moines845 km
  7. 7White River (Indiana)583 km
  8. 8Iowa520 km
  9. 9Kaskaskia515 km
  10. 10Wapsipinicon480 km
  11. 11Rock River459 km
  12. 12Illinois432 km
  13. 13Sangamon396 km
  14. 14Little Wabash River382 km
  15. 15Meramec350 km
  16. 16Pecatonica312 km
  17. 17Embarras298 km
  18. 18Fox River295 km
  19. 19Patoka260 km
  20. 20Big Muddy River251 km
  21. 21Des Plaines241 km
  22. 22Maquoketa240 km
  23. 23Spoon237 km
  24. 24Mackinaw210 km
  25. 25La Moine201 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. An item counts for every first-level unit (state, province, county) it touches: a lake or island by its outline, a river by its course, within about 1.5 km; a summit, a cape or anything without a shape by its point.

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