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).
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.
Pressure/threats to key biodiversity
The main problems are water management (the water-level is deliberately kept high during summer), disturbance by boating, and excessive reed-harvesting (`Other' threat, above).
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).
BirdLife International (2022) Important Bird Areas factsheet: Steile Bank and Mokkebank. Downloaded from
http://www.birdlife.org on 18/01/2022.