Dernford Fen

Dernford Fen is a 10.3 hectare biological Site of Special Scientific Interest north-west of Sawston in Cambridgeshire.

The site is a rare surviving example of rough fen and carr. Other habitats are dry grassland and scrub, together with ditches and a chalk stream. There are breeding warblers, and the diverse habitats are valuable for amphibians and reptiles.

The site is private land with no public access.