Dernford Fen is a biological

Site of Special Scientific Interest A Site of Special Scientific Interest (SSSI) in Great Britain, or an Area of Special Scientific Interest (ASSI) in the Isle of Man and Northern Ireland, is a conservation designation denoting a protected area in the United Kingdom and Isle ...

north-west of

Sawston Sawston is a large village in Cambridgeshire in England, situated on the River Cam about south of Cambridge with a population of 7,271. The village has historical roots dating back to medieval times and has landmarks such as Sawston Hall, a ...

Cambridgeshire Cambridgeshire (abbreviated Cambs.) is a Ceremonial counties of England, ceremonial county in the East of England and East Anglia. It is bordered by Lincolnshire to the north, Norfolk to the north-east, Suffolk to the east, Essex and Hertfor ...

. The site is a rare surviving example of rough

fen A fen is a type of peat-accumulating wetland fed by mineral-rich ground or surface water. It is one of the main types of wetland along with marshes, swamps, and bogs. Bogs and fens, both peat-forming ecosystems, are also known as mires ...

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.

References

{{SSSIs Cambridgeshire Sites of Special Scientific Interest in Cambridgeshire Sawston