Markermeer & IJmeer

Country/territory: Netherlands

IBA Criteria met: A1, A4i, A4iii, B1i, B2, B3, C1, C2, C3, C4, C6 (2016)
For more information about IBA criteria please click here

Area: 68,463 ha

Vogelbescherming Nederland
Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2018 high not assessed medium
For more information about IBA monitoring please click here

Site description
A stagnant freshwater lake, separated from Lake IJsselmeer (034) by the closing of the Houtribdijk in 1975, and bordered to the east by the polders Oostelijk and Zuidelijk Flevoland (reclaimed in 1957 and 1968). The lake is connected to Lake Gooimeer (044) in the south-east, and is also adjacent to Oostvaardersplassen (066) and Lepelaarsplassen (067) in the east, via the Zuidelijk Flevoland polder. The lake has been locally deepened to more than 30 m by sand extraction. This site, together with site 034, formed part of a single, larger site (former site NL030) in the previous international IBA inventory (Grimmett and Jones 1989).

Key biodiversity
Numbers are based on aerial counts which tend to underestimate species with a scattered occurrence (e.g. Chlidonias niger). This is the main feeding area of the Phalacrocorax carbo that breed at Lepelaarsplassen (067) and Naardermeer (074), and is an important moulting area for (subadult) Cygnus olor, Aythya fuligula and Aythya ferina.

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Markermeer & IJmeer. Downloaded from on 28/01/2022.