Which Russian Arctic archipelago includes October Revolution Island and Bolshevik Island?

Severnaya Zemlya is the Russian Arctic archipelago that includes October Revolution Island and Bolshevik Island.

The group lies in the Arctic Ocean north of Siberia and is separated from the Taymyr Peninsula by the Vilkitsky Strait. Its four principal islands are October Revolution, Bolshevik, Komsomolets and Pioneer, accompanied by roughly 70 smaller islands. The archipelago is divided between the Kara Sea and the Laptev Sea by its surrounding straits and channels.

October Revolution Island is the group’s largest island and is heavily glaciated, with several domed ice caps. Bolshevik Island is the southernmost major island and the second largest. Their names reflect the Soviet-era naming scheme used across the archipelago.

The islands were first sighted by the 1913 expedition led by Boris Vilkitsky, but their status as a connected archipelago was not fully charted until the 1930–1932 expedition of Georgy Ushakov and Nikolay Urvantsev. They are uninhabited in the ordinary permanent-settlement sense and have a severe polar climate.