Faddeyevskiy – one of the Islands of Anjou – subgroup of the New Siberian Island Archipelago, Sakha (Yakutia) Republic, Russia. It covers the land area of 5,300 km2 with altitudes of up to 65 m. It is connected with the Kotelny and the Bunge Land Islands, forming a solid landmass. The soil is accumulated by sands and clays, penetrated with underground ice cores. The lake district of the island occupies a small part of the Valleys of the Ulakhan-Yura and Khastyr Rivers. Here approximately 60 cryogenic lakes are located, each of them occupying at least 1–1.5 km2. The surface area of the largest lake is 4.3 km2. There are several small rivers on the island. The prevailing vegetation of the area is mossy and lichenous. Arctic fox cropping is common on the island. It was discovered in 1805 by Yakov Sannikov – the “foreman” of the Syrovatskiy guild of merchant; the island was named after the Russian industrialist Faddeev, who constructed the first winter quarters there.