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Location Netherlands, Friesland
Central coordinates 5o 30.00' East  52o 50.00' North
IBA criteria A4i, A4iii, B1i, B2, C3, C4
Area 4,270 ha
Year of IBA assessment 2000

Vogelbescherming Nederland

Site description An area of sandbanks and shallow waters, with a small reedbed and an embanked grassland polder, along the Frisian south coast. It is a subsite of Lake IJsselmeer (034).

Key Biodiversity The site is an important roost for geese Anser (from Noordoostpolder) and waders, but no recent counts are available. Non-breeding numbers are based on aerial counts which tend to underestimate species with a scattered occurrence. This is the main moulting area for Podiceps cristatus in the Netherlands (up to 20,000). The mean total number of wintering waterbirds exceeds 20,000.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Greater Scaup Aythya marila winter  1987-1991  9,549 individuals  good  A4i, B1i, B2, C3  Least Concern 
Goosander Mergus merganser winter  1987-1990  2,576 individuals  good  A4i, B1i, C3  Least Concern 
Great Crested Grebe Podiceps cristatus non-breeding  1986-1990  7,896 individuals  good  B1i, C3  Least Concern 
Great Cormorant Phalacrocorax carbo non-breeding  1986-1990  6,916 individuals  good  A4i, B1i, C3  Least Concern 
A4iii Species group - waterbirds unknown  1990  20,000 individuals  unknown  A4iii, C4   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Friese IJsselmeerkust I Natural Monument 4,800 protected area overlaps with site 2,580  
Friese IJsselmeerkust II Natural Monument 120 protected area overlaps with site 44  
Huitebuersterbutenpolder Nature Reserve 41 protected area contained by site 41  
Steile Bank en Mokkebank Wetlands of International Importance (Ramsar) 0 protected area overlaps with site 0  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Standing freshwater  100%

Land use

Land-use Extent (% of site)
fisheries/aquaculture 100%
water management 100%
nature conservation and research 60%
tourism/recreation 100%

Protection status National Partial International Partial2,580 ha of IBA covered by Natural Monument (Friese IJsselmeerkust I, 4,800 ha). 44 ha of IBA covered by Natural Monument (Friese IJsselmeerkust II, 120 ha). 41 ha of IBA covered by Nature Reserve (Huitebuersterbutenpolder, 41 ha). 2,624 ha of IBA covered by Special Protection Area (Friese IJsselmeerkust, 5,130 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Steile Bank and Mokkebank. Downloaded from on 25/10/2016

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