|Most recent IBA monitoring assessment|
|Year of assessment||Threat score (pressure)||Condition score (state)||Action score (response)|
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A complex of freshwater lakes (resulting partly from peat diggings), reedbeds and wet meadows, located to the east of the city of Leeuwarden. Human activities include reed-harvesting (`Other' land-use, below), and the site includes two duck decoys.
An important roost for geese Anser which come from surrounding feeding areas.
BirdLife International (2019) Important Bird Areas factsheet: Groote Wielen. Downloaded from http://www.birdlife.org on 11/12/2019.