Kostroma Oblast is a federal subject of Russia. Its administrative center is the city of Kostroma and its population as of the 2021 Census is 580,976. It was formed in 1944 on the territory detached from neighboring Yaroslavl Oblast.
Textile industries have been developed there since the early 18th century. Its major historic towns include Kostroma, Sharya, Nerekhta, Galich, Soligalich, and Makaryev.
Wikipedia https://en.wikipedia.org/wiki/Kostroma_Oblast
Coordinates 57°46'4.497" N 40°55'36.89" E