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Location Norway, Nord-Trøndelag
Central coordinates 11o 25.00' East  63o 50.00' North
IBA criteria A4i, A4iii, B1i, B2, B3
Area 3,610 ha
Altitude 0 - 10m
Year of IBA assessment 2014

Norsk Ornitologisk Forening

Site description The site comprises a 50 km stretch along the north-eastern side of Trondheimsfjord, the third largest fjord in Norway, from south of Levanger to north of Steinkjer. This is a network of 10-12 key wetlands, some of which would qualify as IBAs individually. The main habitats are extensive shallow subtidal areas, intertidal mudflats and the mouths of two large rivers, Verdalselva and Steinkjerelva, as well as those of several smaller ones. Land surrounding the fjord is mainly cultivated, but semi-natural meadows remain intact in a few places. The site includes `Gjørv, Borgenfjorden', an IBA that was listed individually (as site NO030) in the previous European IBA inventory (Grimmett and Jones 1989).

Key Biodiversity Most or all of the Svalbard population of Anser brachyrhynchus (30,000 birds) probably stages in the area in May during spring migration, thus this is probably one of the most important stop-over sites in Norway for the species (c.3,000 stage at Gjørv [Borgenfjorden] alone). The geese forage on the mudflats, but spend the nights on the water. The area is notable as a staging area for other seabirds, waders and ducks as well. Seaduck such as Melanitta nigra, M. fusca, Bucephala clangula and Clangula hyemalis occur in large numbers on spring migration. The estimated number of geese, ducks, waders and gulls staging in the whole area is 35,000-60,000.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Pink-footed Goose Anser brachyrhynchus passage  2005-2014  70,000-80,000 individuals  good  A4i, B1i  Least Concern 
Greylag Goose Anser anser passage  2009-2013  7,000-9,300 individuals  good  B1i  Least Concern 
Common Eider Somateria mollissima winter  2004-2013  2,000-5,000 individuals  medium  B1i, B3  Near Threatened 
Horned Grebe Podiceps auritus winter  2004-2013  100-200 individuals  good  B1i, B2  Vulnerable 
A4iii Species group - waterbirds passage  2005-2014  77,000-89,300 individuals  good  A4iii   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Alnes Wildlife Conservation Area 112 protected area contained by site 0  
Bjørga Wildlife Conservation Area 104 protected area contained by site 0  
Eidsbotn Flora and Fauna Protection Area 230 protected area contained by site 230  
Falstadbukta Wildlife Conservation Area 128 protected area contained by site 0  
Hammeren Nature Reserve 42 protected area contained by site 40  
Kausmofjæra Wildlife Conservation Area 100 protected area contained by site 0  
Lundleiret Wildlife Conservation Area 211 protected area contained by site 0  
Ørin Nature Reserve 48 protected area contained by site 49  
Rinnleiret Nature Reserve 186 protected area contained by site 210  
Tynesfjæra Wildlife Conservation Area 106 protected area contained by site 0  
Vellamelen Wildlife Conservation Area 84 protected area contained by site 0  


IUCN habitat Habitat detail Extent (% of site)
Coastline Mud flats & sand flats; Salt marshes; Tidal rivers & enclosed tidal waters  15%
Sea Sea inlets and coastal features  85%

Land use

Land-use Extent (% of site)
military -
nature conservation and research -
tourism/recreation -
urban/industrial/transport -
hunting -

Protection status National Low International None40 ha of IBA covered by Nature Reserve (Hammeren, 40 ha). 210 ha of IBA covered by Nature Reserve (Rinnleiret, 210 ha). 49 ha of IBA covered by Nature Reserve (Ørin, 49 ha). 230 ha of IBA covered by Flora and Fauna Protection Area (Eidsbotn, 230 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Inner Trondheimsfjord. Downloaded from on 20/10/2016

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