Оренбургская губерния
In 1736, Okhotsky Uyezd was split off from Yakutsky Uyezd. In the same year, Siberia Governorate was split into two independent areas: Siberia Province, which consisted of the former Tobolsk and Yeniseysk Provinces, under the authority of the governor (posted in Tobolsk), and Irkutsk Province. In 1737, the areas in the South Urals were organized into Iset Province with the center in the town of Shadrinsk, and the province was transferred into Orenburg Governorate. In 1764, Irkutsk Governorate was established in place of the former Irkutsk Province.