Vilkitsky Island (East Siberian Sea) Russian Arctic Ocean Hydrographic Expedition led by Boris Vilkitsky on the ships "Taymyr" and "Vaygach" on behalf of the Russian Hydrographic Service in order to chart the last blank areas of Russian maps. Vilkitsky Island (East Siberian Sea) Vilkitsky Island (; "Ostrov Vilkitskogo") is the southernmost island of the De Long group in the northern part of the East Siberian Sea. Administratively Vilkitsky Island belongs to the Sakha Republic administrative division of the Russian Federation. The island is named after Russian hydrographer Boris Vilkitsky. The island is outside of the limits of permanent ice and is unglaciated. At barely Vilkitsky
East Siberian Sea 11,430 km, respectively; while the respective inflow values are 3,240, 8,800 and 9,230 km. The surface water temperature decreases from south to north. In winter it varies between −0.2 and 0.6 °C at the river deltas and from −1.7 to −1.8 °C in the northern sea part. In summer, it warms to 7–8 °C in the bays and inlets and to 2–3 °C in the ice-free sea zones. Surface water salinity increases from southwest to northeast. In winter and spring, it is 4–5‰ (parts per thousand) near the deltas of the Kolyma and Indigirka rivers. It increases to 28–30‰ in