GeotchaA geography quiz on a real globe

25 longest rivers of the South China 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. 1Mekong4,350 km
2. 2Yu River1,152 km
3. 3Red River1,149 km
4. 4Kapuas1,143 km
5. 5Black River910 km
6. 6Nanpan856 km
7. 7Batang Hari800 km
8. 8Ping800 km
9. 9Chi765 km
10. 10Nan740 km
11. 11Mun673 km
12. 12Hongshui638 km
13. 13Yom600 km
14. 14Dong Nai586 km
15. 15Batang Rajang563 km
16. 16Dong523 km
17. 17Cả River513 km
18. 18Pa Sak513 km
19. 19Ma River512 km
20. 20Cagayan505 km
21. 21Musi500 km
22. 22Ngom Qu500 km
23. 23Lô River470 km
24. 24Pahang459 km
25. 25Nam Ou448 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 South China Sea basin: every river here whose waters reach the South China 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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