GeotchaA geography quiz on a real globe

Longest river of each 30° band of longitude

12 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. 1Nile6,650 km
  2. 2Amazon6,400 km
  3. 3Yangtze6,300 km
  4. 4Yellow River5,464 km
  5. 5Congo4,700 km
  6. 6Irtysh4,248 km
  7. 7Mississippi3,766 km
  8. 8Missouri3,726 km
  9. 9Yukon3,190 km
  10. 10Kolyma2,129 km
  11. 11Columbia2,000 km
  12. 12Gambia1,130 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. One per group: the longest river of each 30° band of longitude by this measure, then ranked together. Bands of longitude 30° wide, from the prime meridian: 0°–30° E, 30°–60° E, … and 0°–30° W, …

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