GeotchaA geography quiz on a real globe

12 longest rivers in South Dakota

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. 1Missouri3,726 km
  2. 2James (Dakotas)1,143 km
  3. 3White River (Missouri River tributary)933 km
  4. 4Niobrara915 km
  5. 5Little Missouri River901 km
  6. 6Big Sioux River674 km
  7. 7Minnesota534 km
  8. 8Cheyenne475 km
  9. 9Belle Fourche470 km
  10. 10Little White River377 km
  11. 11Moreau320 km
  12. 12Rock River (Big Sioux River tributary)232 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.

Similar quizzes