Kolchak Island or Kolchaka Island (Russian: остров Колчака, ostrov Kolchaka), is an island in the Kara Sea located NE of the Shturmanov Peninsula, in an area of skerries south of the Nordenskiöld Archipelago, formerly known as Rastorguyev Island (Russian: остров Расторгуева, ostrov Rastorguyeva) in 1937-2005 . Compared to other large islands in the area it has a quite regular shape. Its length is 21 km and its maximum width 6.5 km.