GeotchaA geography quiz on a real globe

25 longest rivers of the North Sea basin

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. 1Rhine1,233 km
2. 2Elbe1,094 km
3. 3Meuse950 km
4. 4Moselle544 km
5. 5Main524 km
6. 6Weser451 km
7. 7Vltava430 km
8. 8Saale413 km
9. 9Spree382 km
10. 10Ems371 km
11. 11Neckar362 km
12. 12Thames334 km
13. 13Havel325 km
14. 14Trent298 km
15. 15Aare295 km
16. 16Werra292 km
17. 17Leine281 km
18. 18Aller263 km
19. 19Weisse Elster257 km
20. 20Lippe255 km
21. 21Ohře247 km
22. 22Saar246 km
23. 23Lahn242 km
24. 24River Great Ouse240 km
25. 25Sázava226 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 North Sea basin: every river here whose waters reach the North Sea or a sea, gulf or bay inside it, as the IHO's sea areas nest (the North Sea lies in the Atlantic, the Adriatic in the Mediterranean), directly or through other rivers and lakes, following where Wikidata says each river flows (P403) downstream. Rivers of inland basins (the Caspian Sea, Lake Balkhash) reach no ocean.

On the map

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