GeotchaA geography quiz on a real globe
25 longest tributaries of the Ob
25 tributaries, 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 tributaries
- 1Irtysh4,248 km
- 2Chulym1,799 km
- 3Ket1,621 km
- 4Vasyugan1,082 km
- 5Bolshoy Yugan1,063 km
- 6Vakh964 km
- 7Tym950 km
- 8Aley858 km
- 9Tom827 km
- 10Severnaya Sosva754 km
- 11Katun688 km
- 12Inya663 km
- 13Kazym659 km
- 14Chumysh644 km
- 15Bolshoy Salym583 km
- 16Tromyogan581 km
- 17Charysh547 km
- 18Nazym422 km
- 19Lyamin420 km
- 20Pim390 km
- 21Shegarka382 km
- 22Poluy369 km
- 23Berd363 km
- 24Kunovat362 km
- 25Kulyogan342 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. Tributaries: the rivers that flow straight into the Ob, as Wikidata records where each river flows (P403) or which rivers flow into it (P974). A named stretch of the Ob (the Solimões of the Amazon) counts as the Ob; a river that reaches it through a lake or through a river too short for this pool is in its basin, not one of its tributaries. Their own tributaries are left out.
On the map
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