The fall of Qashliq ("kash-lik") occurred in this 
The fall of Qashliq ("kash-lik") occurred in this region following the Battle of Chuvash Cape, a victory for Yermak Timofeyevich, and later the Czechoslovak Legion was forced to cross it. This region saw conflicts at the fortress of Albazin leading to a treaty with the Qing Dynasty. Migration to this region was supported by Pyotr Stolypin, and Sergei Witte built a railway that crossed it. This place served as a place of exile for people like the Decembrists and Stalin, and it is home to enormous oil and natural gas deposits. For 10 points, identify this region east of the Urals, the Asian part of Russia.
The fall of Qashliq ("kash-lik") occurred in this region following the Battle of Chuvash Cape, a victory for Yermak Timofeyevich, and later the Czechoslovak Legion was forced to cross it.
Siberia [accept Tyumen Oblast until "Czechoslovak Legion" is read; prompt on "Russia" before it is read] 