Russian Empire Bolsheviks followed in 1918. The administrative boundaries of European Russia, apart from Finland and its portion of Poland, coincided approximately with the natural limits of the East-European plains. In the North it met the Arctic Ocean. Novaya Zemlya and the Kolguyev and Vaygach Islands also belonged to it, but the Kara Sea was referred to Siberia. To the East it had the Asiatic territories of the Empire, Siberia and the Kyrgyz steppes, from both of which it was separated by the Ural Mountains, the Ural River and the Caspian Sea — the administrative boundary, however, partly extending into Asia on
Severnaya Zemlya Sea Route in what was seen as the culmination of the Great Northern Expedition, an ambitious enterprise initially conceived by emperor Peter I the Great in order to map the whole of the northern coast of Russia to the east. On 3 September 1913 (22 August 1913 in the Julian calendar used by Russia at the time), members of Vilkitsky's expedition landed on what is now known as Cape Berg on October Revolution Island. They raised the Russian flag on the shore and named the new territory Tayvay Land (, "Zemlya Tayway"), after the first syllable of their icebreakers' names.