The area is situated in the Demer river valley, west and east of the town of Diest. It comprises a rich variety of former river arms, peat ponds, marshes, reedbeds, sedge-fields, humid grasslands and alluvial forests, including heathland relicts on the sandy hills bordering the valley.
A breeding and staging area for meadow birds, waders and waterfowl.
Pressure/threats to key biodiversity
The area is included in the `Ecologisch Impulsgebied', an integrated conservation and development project. 1,216 ha of IBA covered by proposed Site of Community Importance (Demervallei ten oosten van Aarschot, 1,432 ha).
National Low International High57 ha of IBA covered by Nature Reserve (Demerbroeken, 57 ha). 62 ha of IBA covered by Nature Reserve (Langdonken, 62 ha). 7,010 ha of IBA covered by Special Protection Area (De Demervallei, 7,010 ha).
BirdLife International (2020) Important Bird Areas factsheet: Demervallei. Downloaded from
http://www.birdlife.org on 28/03/2020.