Which plain is washed from the north by the waters of the White and Barents Seas?

The East European Plain in the Russian Federation (also called Russian) is located in the eastern part of Europe, the northern part of which is washed by the waters of the Barents and White Seas. The southern part of the plain is washed by the Azov, Black and Caspian Seas. The length of the East European Plain from north to south is 2.5 thousand kilometers. The relief of this area is flat, on which there are no natural phenomena in the form of earthquakes, volcanic eruptions.