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Location Norway, Akershus
Central coordinates 11o 9.00' East  59o 53.00' North
IBA criteria A1, B1i, B2, B3
Area 6,380 ha
Altitude 101 - 150m
Year of IBA assessment 2014

Norsk Ornitologisk Forening

Site description The largest inland delta in Scandinavia, formed by the mouths of the Glomma, Leira and Nilelva rivers flowing into Lake Øyeren. The northern part is shallow, with inland areas covered by deciduous forest, scrub, grassland and agricultural land.

Key Biodiversity An important area for migrating waterbirds, and for swans Cygnus in winter, as well as for breeding Pandion haliaetus. Breeding species of global conservation concern which do not meet IBA criteria: Crex crex (1-2 pairs).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Pink-footed Goose Anser brachyrhynchus passage  2004-2013  260-1,700 individuals  good  B1i  Least Concern 
Barnacle Goose Branta leucopsis passage  2004-2013  671-1,500 individuals  good  B1i  Least Concern 
Whooper Swan Cygnus cygnus winter  2004-2013  230-1,040 individuals  good  B1i, B3  Least Concern 
Common Teal Anas crecca passage  2004-2013  1,265-5,400 individuals  good  B1i  Least Concern 
Eurasian Curlew Numenius arquata passage  2004-2014  11-292 individuals  good  A1  Near Threatened 
Osprey Pandion haliaetus breeding  2004-2013  6-9 breeding pairs  good  B2  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Nordre Oyeren Wetlands of International Importance (Ramsar) 6,260 protected area contained by site 6,260  
Nordre øyeren Nature Reserve 6,257 protected area contained by site 6,260  


IUCN habitat Habitat detail Extent (% of site)
Forest Broadleaved deciduous woodland; Mixed woodland; Native coniferous woodland  5%
Wetlands (inland) Rivers and streams; Standing freshwater  90%
Artificial - terrestrial Arable land  5%

Land use

Land-use Extent (% of site)
hunting 50%
agriculture 5%
tourism/recreation 90%
water management 90%

Protection status National Partial International Partial6,260 ha of IBA covered by Nature Reserve (Nordre Øyeren, 6,260 ha). 6,260 ha of IBA covered by Ramsar Site (Nordre Øyeren, 6,260 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Nordre Øyeren & Sørumsneset. Downloaded from on 27/10/2016

To provide new information to update this factsheet or to correct any errors, please email BirdLife