'northern sea city'), known as Vayenga (Ваенга) until 18 April 1951,[2] is a closed town in Murmansk Oblast, Russia.

The town is situated on the coast of the Barents Sea along the Kola Bay 25 kilometers (16 mi) northeast of Murmansk, the administrative centre of the oblast, to which it is connected by railway and a motorway.

It is the main naval base of the Northern Fleet of Russia and the sixth largest city in the world beyond the Arctic Circle.

151 Wing RAF to protect the Arctic Convoys before their fighters were later handed over to the Soviet Naval Aviation.

By the 1960s, the town was already thoroughly developed - the city had a bakery, a sausage factory, and a soft drink bottling plant, and a swimming pool was built.

On 26 November 1996, by the decree of the President of the Russian Federation, the town of Severomorsk, as a major naval base, was transformed into a closed administrative-territorial entity (ZATO) (urban district) with the inclusion of the following populated areas under its jurisdiction: Safonovo, Roslyakovo, Safonovo-1, Severomorsk-3, and Shchukozero.

Severomorsk has a subarctic climate (Dfc), with long, very cold winters and cool to mild summers.

On May 13, 1984, on the outskirts of Severomorsk, there was a major fire at a stockpile of naval missiles that resulted in numerous large explosions on May 17.

The incident killed 200–300 people and destroyed at least one-third of the Northern Fleet's stockpile of surface-to-air missiles.