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.
BirdLife International (2019) Important Bird Areas factsheet: Steile Bank and Mokkebank. Downloaded from http://www.birdlife.org on 16/12/2019.