Irkutsk Region (Pribaikalye, Priangarie) is a constituent entity of the Russian Federation in the southeastern part of the Siberian Federal District.
It was formed on September 26, 1937, when the East Siberian region of the RSFSR was divided into Irkutsk and Chita oblasts.
It borders on the west with the Krasnoyarsk Territory, in the northeast with Yakutia, in the east with the Trans-Baikal Territory, in the east and south with Buryatia, in the south-west with Tuva.
The administrative center is the city of Irkutsk. It is part of the East Siberian economic region.
The area is 774,846 km ² (4.52% of the territory of Russia).
The population is 2 408 901 people. (2017).
Center of the city of Irkutsk. Irkutsk is a city in Russia, the administrative center of the Irkutsk region and the Irkutsk region, forms the city district of the city of Irkutsk. The sixth largest city in Siberia with a population of 623,736  people. (2017). Within the Irkutsk agglomeration for 2016, there are 1.1 million people .
It is located in Eastern Siberia, on the banks of the Angara River, at the confluence of the Irkut River (hence the name of the city), 66 km from Baikal . The climate is sharply continental  with significant temperature changes. Because of the proximity to the seismically active Baikal rift, regular weak earthquakes are regular.