A large eutrophic lake surrounded by farmland, in the vicinity of Oulu lake. The shores are fringed by narrow belts of Carex marsh, whilst the shallow waters support stands of Equisetum, Phragmites and Scirpus. Floating vegetation is also abundant. On the shores are numerous settlements whose people fish and hunt on the lake.
An important breeding area for Larus minutus.
National None International High414 ha of IBA covered by Special Protection Area (Ahmasjärvi).
BirdLife International (2019) Important Bird Areas factsheet: Ahmasjärvi lake. Downloaded from
http://www.birdlife.org on 13/12/2019.