The Sundrun River is a river in the Sakha Republic (Yakutia) of the Russian Federation. It crosses the tundra first in a roughly eastern and then, more than halfway through its course, in a northern direction. It flows into the East Siberian Sea

East Siberian Sea

The East Siberian Sea is a marginal sea in the Arctic Ocean. It is located between the Arctic Cape to the north, the coast of Siberia to the south, the New Siberian Islands to the west and Cape Billings, close to Chukotka, and Wrangel Island to the east...

 at the western end of the Kolyma Bay

Kolyma Bay

The Kolyma Bay is one of the main gulfs of the East Siberian Sea.The bay gets its name from the Kolyma Lowlands, whose coastline forms the whole eastern half of this bay. The Kolyma Lowlands are dotted with numerous lakes and swamps...

. The Sundrun River freezes up in early October and remains icebound until June.

Wetlands

The Kytalyk Wetlands, located between the Sundrun and the Khroma River

Khroma River

The Khroma River is a river in the Sakha Republic of the Russian Federation. It crosses the tundra roughly northeastwards and flows into Khromskaya Bay which is connected with the East Siberian Sea...

 (Khroma-Sundrun Interfluvial Area) is an ecologically important area, providing a favorable habitat for many rare animals. It is practically uninhabited and full of lakes and marshes. Wild reindeer

Reindeer

The reindeer , also known as the caribou in North America, is a deer from the Arctic and Subarctic, including both resident and migratory populations. While overall widespread and numerous, some of its subspecies are rare and one has already gone extinct.Reindeer vary considerably in color and size...

 and Siberian crane

Siberian Crane

The Siberian Crane also known as the Siberian White Crane or the Snow Crane, is a bird of the family Gruidae, the cranes...

s are abundant in the Sundrun River wetlands.

The lesser white-fronted goose

Lesser White-fronted Goose

The Lesser White-fronted Goose is a goose closely related to the larger White-fronted Goose .It breeds in northernmost Asia, but it is a scarce breeder in Europe. There is a re-introduction scheme in Fennoscandia....

, Brent goose

Brent Goose

The Brant or Brent Goose, Branta bernicla, is a species of goose of the genus Branta. The Black Brant is an American subspecies. The specific descriptor bernicla is from the same source as "barnacle" in Barnacle Goose, which looks similar but is not a close relation.-Appearance:The Brant Goose is...

, Bewick's swan

Bewick's Swan

The Tundra Swan is a small Holarctic swan. The two taxa within it are usually regarded as conspecific, but are also sometimes split into two species, Cygnus bewickii of the Palaearctic and the Whistling Swan, C. columbianus proper, of the Nearctic...

 and the spectacled eider

Spectacled Eider

The Spectacled Eider is a large sea duck that breeds on the coasts of Alaska and northeastern Siberia.The lined nest is built on tundra close to the sea, and 5–9 eggs are laid. This species dives for crustaceans and molluscs...

are also found in the Khroma-Sundrun Interfluvial Area.