Kaluzhsky Uyezd

Kaluga (, ) is a city and the administrative center of Kaluga Oblast, Russia. It stands on the Oka River southwest of Moscow. Its population was 337,058 at the 2021 census.

thumb|The Trinity Church in Lyubutsk Lyubutsk (Lyubutsk, Lyubutesk, ) was a Russian fortress, located about below the confluence the Oka River with Dugna in the present-day Kaluga Oblast. Its name derives from a rivulet flowing on northern and eastern sides of the city.