From the Wikipedia page [1]
Murmansk Oblast (Russian: Му́рманская о́бласть, tr. Murmanskaya oblast; IPA: [ˈmurmənskəjə ˈobləsʲtʲ]) is a federal subject of Russia (an oblast), located in the northwestern part of Russia. Its administrative center is the city of Murmansk.
The oblast was established on May 28, 1938 from Murmansk Okrug of Leningrad Oblast (comprising the city of Murmansk, Kirovsky, Kolsky, Lovozersky, Polyarny, Saamsky, Teribersky, and Tersky Districts) and Kandalakshsky District of the Karelian ASSR.