Omsk Oblast is a federal subject of Russia, located in southwestern Siberia. The oblast has an area of 139,700 square kilometers. Its population is 1,977,665 with the majority, 1.15 million, living in Omsk, the administrative center.
The oblast borders with Tyumen Oblast in the north and west, Novosibirsk and Tomsk Oblasts in the east, and with Kazakhstan in the south.
Wikipedia https://en.wikipedia.org/wiki/Omsk_Oblast
Coordinates 54°59'28.95" N 73°22'17.504" E