Chaun delta

IBA Justification

The site was identified as important in 2004 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species'):
Species Current IUCN Red List Category Season Year(s) Population estimate at site IBA criteria met
Tundra Swan Cygnus columbianus LC breeding 1997 200 breeding pairs A3
Brent Goose Branta bernicla LC breeding 1997 present A3, A4i
Greater White-fronted Goose Anser albifrons LC breeding 1997 present A3
Lesser White-fronted Goose Anser erythropus VU breeding 1997 present A1, A3
Long-tailed Duck Clangula hyemalis VU breeding 1997 abundant A3, A4i
Spectacled Eider Somateria fischeri NT breeding 1997 2,000 breeding pairs A3, A4i
King Eider Somateria spectabilis LC breeding 1997 common A3
Common Eider Somateria mollissima NT breeding 1997 frequent A3
Greater Scaup Aythya marila LC breeding 1997 uncommon A3
Baikal Teal Sibirionetta formosa LC breeding 1997 rare A1
Sandhill Crane Grus canadensis LC breeding 1997 frequent A3
Yellow-billed Loon Gavia adamsii NT breeding 1997 rare A3
Grey Plover Pluvialis squatarola LC breeding 1997 uncommon A3
Ruddy Turnstone Arenaria interpres LC breeding 1997 uncommon A3
Dunlin Calidris alpina LC breeding 1997 common A3
A4iii Species group - waterbirds n/a breeding 1997 min 20,000 individuals A4iii

The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2004).

IBA Protection

Protected area (PA) PA designation PA area (ha) Relationship of PA with IBA Overlap of PA with IBA (ha)
Chaunskaya guba Zakaznik 210,500 protected area overlaps with site 12,500


Habitat (IUCN level 1) Habitat detail Extent (% of site)
Grassland Tundra -
Wetlands (inland) -
For more information about the IUCN Habitat classification, please click here.

Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Chaun delta. Downloaded from on 03/12/2023.