Four of the main islands are largely glaciated, October Revolution, Komsomolets, and Pioneer, as well as the smaller Schmidt Island at the northwestern limit. The glacierised area on Bolshevik, the southernmost main island of the group, covers about a quarter of its land's surface. The southmost point of Severnaya Zemlya is Cape Neupokoyev at the SW end of Bolshevik Island. The highest point of the archipelago is Mount Karpinsky, the summit of the Karpinsky Glacier, an ice dome on October Revolution Island. The Red Army Strait separates Komsomolets Island from October Revolution Island and the broader Shokalsky Strait Bolshevik Island from October Revolution Island. Both straits connect the Kara Sea in the west with the Laptev Sea in the east.