Sannikov Land
Detailed mapping of the coast of the Laptev Sea and New Siberian Islands was performed by Pyotr Anjou, who in 1821–1823 traveled some over the region on sledges and small boats, searching for the Sannikov Land and demonstrating that large-scale coastal observations can be performed without ships. Anzhu Islands (the northern part of New Siberian Islands) were named after him. In 1875, Adolf Erik Nordenskiöld was the first to travel across the whole sea on a steamship "Vega".