Novosibirsk Oblast (Russian: Новосиби́рская о́бласть, Novosibirskaya oblast) is a federal subject of Russia (an oblast) located in southwestern Siberia. Its administrative and economic center is the city of Novosibirsk. The population was 2,665,911 as of the 2010 Census.

Novosibirsk Oblast is located in the south of the West Siberian Plain, at the foothills of low Salair ridge, between the Ob and Irtysh Rivers. The oblast borders Omsk Oblast in the west, Tomsk Oblast in the north, Kemerovo Oblast in the east, and Altai Krai together with Kazakhstan (Pavlodar Province) in the south. The territory of the oblast extends for more than 600 kilometers (370 mi) from west to east, and for over 400 kilometers (250 mi) from north to south. The oblast is mainly plain; in the south the steppes prevail; in the north enormous tracts of woodland with great number of marshes prevail. There are many lakes, the largest ones located at the south. The majority of the rivers belong to the Ob basin, many of them falling in dead lakes. Largest lakes are Chany, Sartlan, Ubinskoye, and some others.

As of 2007, the oil reserves of the region amounted to 204 million tons. In addition, Novosibirsk Oblast had free gas reserves of 600 million cubic meters, solute gas reserves of 5.2 billion cubic meters, and gas condensate reserves of 121,000 tons. Most of the oil and gas reserves are located in the Severny and Kyshtovsky districts.

...
Wikipedia