GeotchaA geography quiz on a real globe

12 longest rivers of the Indigirka basin

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. 1Indigirka1,726 km
  2. 2Selennyakh796 km
  3. 3Byoryolyokh754 km
  4. 4Uyandina586 km
  5. 5Allaikha563 km
  6. 6Badyarikha545 km
  7. 7Khatyngnakh444 km
  8. 8Moma406 km
  9. 9Elgi394 km
  10. 10Shangina344 km
  11. 11Khastakh251 km
  12. 12Irgichyan211 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 Indigirka basin: the Indigirka 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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