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. As of the 2010 Census, its population was 795,409.

Geographically, Murmansk Oblast is located mainly on the Kola Peninsula almost completely north of the Arctic Circle and is a part of the larger Lapland region that spans over four countries. The oblast borders with the Republic of Karelia in Russia in the south, Lapland Region in Finland in the west, Finnmark County in Norway in the northwest, and is washed by the Barents Sea in the north and the White Sea in the south and east.Arkhangelsk Oblast of Russia lies across the White Sea.

Much of the oblast's relief is hilly, with the Khibiny and Lovozero ranges rising as high as 1,200 meters (3,900 ft) above sea level and stretching from west to east. The north of the oblast is mostly covered by tundra; forest tundra prevails further south, while the southern regions are in the taiga zone. There are over 100,000 lakes and 18,000 rivers in the oblast.

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