Tyumen Oblast actually encompasses the two territories to its north, Khantia-Mansia and Yamalia, making it the 3rd largest administrative division in Russia. The region around Tyumen is the heart of historic Siberia, with Tobolsk being the former capital of "Western Siberia," a region comprising today's Urals and Western Siberia. Some of history's most famous Siberians hail from this area, most notably Irving Berlin and Rasputin.
Even tourists just passing through this region should make a point of visiting Tobolsk for its magnificent and unique kremlin. Most will also visit historic Tyumen, the regional capital, located on the Trans-Siberian Railway.