New Siberia or Novaya Sibir (/ˈnoʊvaɪə sɪˈbɪər/; Russian: Но́вая Сиби́рь, Nóvaya Sibír', [ˈnovəjə sʲɪˈbʲirʲ]; Yakut: Саҥа Сибиир, romanized: Saña Sibîr) is the easternmost of the Anzhu Islands, the northern subgroup of the New Siberian Islands lying between the Laptev Sea and East Siberian Sea.

Eocene sand, silt, clay, and brown coal overlies an erosional unconformity cut into the Late Cretaceous sediments.

Directly overlying the Eocene sediments and another erosional unconformity are sands of Oligocene and Early Miocene age.

This ice complex accumulated over tens of thousands of years during the Late Pleistocene, through the Last Glacial Maximum, until it stopped at about 10,000 BP.

[2][3][4] New Siberia Island is noted for abundant upright tree trunks, logs, leaf prints, and other plant debris that occur within sediments that are exposed along sea cliffs and within the uplands of the Derevyannye Hills along its southern coast.

[5][8][9] At one time, the highly folded layers of sand, silt, mud, clay, and brown coal containing these coalified tree fossils were once thought to have accumulated during either the Miocene or Eocene Epoch.