Vilkitsky Island – one of the islands within the De Long group of islands in the East Siberian Sea included into the New Siberian Islands, the Sakha Republic (Yakutia), Russia. It lies in the northwestern part of the East Siberian Sea, in the northeastern part of the New Siberian Islands, and in the southern part of the De Long Islands, of which it is the southernmost and the smallest. Closest islands are Zhokhov Island (40 km to the northwest), Bennett Island (30 km to the northwest), and Novaya Sibir’ Island (74 km to the southwest). V.I. is outside the permafrost zone and is not covered with continuous glacier. The island is built from deeply eroded basaltic lava of Neogene and Quaternary nephelinic stream flows, as well as from alkali ultrabasic rock. It was discovered and mapped in 1913 by the participants of the Russian Imperial Hydrographic Expedition in the Arctic Ocean on icebreakers “Taymyr” and “Vaygach” under the command of the captain II rank B. A. Vilkitsky. It was named in 1914 in honor of the expedition leader’s father, the Russian hydrographer, geodesist and Arctic explorer, and lieutenant general of the Corps of Fleet Navigators, A. I. Vilkitsky, who died in 1913.