Severnaya Zemlya any traces of land to the north of the wide strait between the Kara Sea and the Laptev Sea that they navigated. The archipelago was not put on the map until the 1913–1915 Arctic Ocean Hydrographic Expedition of icebreakers "Taimyr" and "Vaigach". The chief organiser and first captain of the Vaygach was officer Aleksandr Vasiliyevich Kolchak of the Imperial Russian Navy. The expedition was privately financed and was launched in 1910, being led by Boris Vilkitsky on behalf of the Russian Hydrographic Service. This venture accomplished its goal of exploring the uncharted areas of the continental side of the Northern
Severnaya Zemlya less glaciated than the other islands of Severnaya Zemlya. Only about 30% of the island is covered by glaciers while the coastal plains have a sparse vegetation of moss and lichen. The Leningrad Glacier, Semyonov-Tyan-Shansky Glacier, Kropotkin Glacier, Mushketov Glacier and Aerosyomki Glacier are located in the interior of the island and do not reach the sea. "Ostrov Tash" is a small island located on Bolshevik's southern shore. "Lavrov Island" is located off the NE shore and "Ostrov Lishniy" off its northern tip. Komsomolets Island () is the northernmost island of the Severnaya Zemlya group in the Russian Arctic, and