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 of ...

north-west of

Sawston Sawston is a large village in Cambridgeshire in England, situated on the River Cam about south of Cambridge. It has a population of 7,260. History Prehistory Although the current village of Sawston has only existed as anything more than a ha ...

Cambridgeshire Cambridgeshire (abbreviated Cambs.) is a Counties of England, county in the East of England, bordering Lincolnshire to the north, Norfolk to the north-east, Suffolk to the east, Essex and Hertfordshire to the south, and Bedfordshire and North ...

. 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 wetlands along with marshes, swamps, and bogs. Bogs and fens, both peat-forming ecosystems, are also known as mires. T ...

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