Shirokostan Peninsula – is situated in the north of Van’kina Guba in the Laptev Sea, the Sakha Republic, Yakutia. It is protruded 40 km from the continent. The width of the central part is approx. 28 km the west coast of the peninsula is divided into two parts by a small shallow bay with a river flowing into its mouth (Tyuryut River). The south part, which ends with the Cape Kurtakh, forms a wide ledge to the south. The northwest end of the peninsula is the low Cape Churkin.