One of its tributaries flows through the former capital of the Alash Autonomy, Semipalatinsk.
This river's eastern watershed includes the Kuznetsk Basin, a major coal mining area. This river's western watershed was the site of the 1957 Kyshtym nuclear disaster, in which an explosion at the Mayak industrial complex forced the evacuation of over 10,000 people. The Yamburg natural gas field is in this river's extremely long namesake (*) gulf. One of its tributaries flows through the former capital of the Alash Autonomy, Semipalatinsk. For irrigation purposes, the government of the Xinjiang region controversially diverts much of this river's  ► Irtysh tributary, which rises in the Altai Mountains. This river flows through Novosibirsk, while its tributaries flow through Yekaterinburg and Astana. For 10 points, name this Siberian river west of the Yenisei and Lena.
This river's eastern watershed includes the Kuznetsk Basin, a major coal mining area.
Ob River (accept Gulf of Ob)