GeotchaA geography quiz on a real globe

17 longest rivers of the Colorado basin

17 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. 1Colorado2,334 km
  2. 2Green River1,175 km
  3. 3Gila1,044 km
  4. 4San Juan616 km
  5. 5Little Colorado River507 km
  6. 6Yampa402 km
  7. 7Dolores400 km
  8. 8Salt River322 km
  9. 9White River (Green River tributary)314 km
  10. 10Santa Cruz (Arizona)296 km
  11. 11Gunnison290 km
  12. 12Verde274 km
  13. 13Puerco269 km
  14. 14Virgin261 km
  15. 15Little Snake River241 km
  16. 16San Pedro230 km
  17. 17Animas203 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. The Colorado basin: the Colorado and every river here that flows into it, directly or through other rivers and lakes, following where Wikidata says each river flows (P403) downstream.

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