Historical clue formulations

• ___ Mountains, Europe/Asia boundary — 2026-03-24
• River through Kazakhstan — 2024-06-23
• Risk territory between Ukraine and Siberia — 2024-05-03
• Eurasian river — 2024-01-10
• Russian region — 2023-08-18
• ___ Mountains, range from the Arctic Ocean to Kazakhstan — 2023-06-12
• Orenburg's river — 2023-01-28
• ___ Mountains, formation made by the collision of the continents Laurasia and Kazakhstania — 2022-11-23
• Europe's third-longest river — 2022-10-06
• Russia's ___ Mountains — 2022-08-09
• Neighbor of Siberia, in Risk — 2022-02-20
• Russian river — 2022-01-17
• ___ Mountains, range crossed on the Trans-Siberian railway — 2022-01-07
• Russia's ___ Mountains — 2021-12-21
• River that's a letter off from 20-Across — 2021-11-13
• ___ Mountains, dividers of Europe and Asia — 2021-04-07
• Name of a mountain range or a river — 2021-01-05
• River of Eurasia — 2020-01-07
• Territory east of Ukraine on a Risk board — 2020-01-02
• Third-longest river in Europe, after the Volga and Danube — 2019-10-27
• Risk territory bordering Ukraine and Afghanistan — 2019-06-08
• Border mountain between Europe and Asia — 2019-03-04
• Russia's ___ Mountains — 2019-02-06
• Asian territory in Risk — 2018-12-09
• River through Russia and Kazakhstan — 2018-02-18
• Like Mount Narodnaya — 2018-02-04
• Territory north of Afghanistan, in Risk — 2017-12-13
• River to the Caspian — 2017-11-28
• Territory in Risk — 2017-11-05
• River forming part of the boundary between Europe and Asia — 2017-09-06
• Asian territory in the game Risk — 2017-08-06
• River bisecting Orsk — 2017-05-05
• ___ Mountains (range east of Moscow) — 2016-07-25
• Eurasia's ___ Mountains — 2016-07-19
• Eurasian boundary — 2016-06-24
• River past Orsk — 2016-04-17
• Russia's ___ Mountains — 2016-02-22
• Risk territory west of Siberia — 2015-10-09
• Russia's ___ Airlines — 2015-07-09
• It flows to the Caspian — 2015-07-05
• Caspian Sea feeder — 2015-01-25
• ___ Mountains (continent separator) — 2014-12-16
• Russia's ___ Mountains — 2014-11-10
• Russia's ___ Airlines — 2014-09-14
• Eurasia's ___ Mountains — 2014-06-24
• Russia's ___ Mountains — 2014-01-14
• ___ Mountains (Eurasian range) — 2013-09-30
• River to the Caspian Sea — 2013-07-30
• River through Kazakhstan — 2013-04-09
• Russia's ___ Mountains — 2013-03-26