Fleam Dyke is a linear earthwork between Fulbourn and Balsham in Cambridgeshire, initiated at some timepoint between AD 330 and AD 510. It is three miles long and seven metres high from ditch to bank, and its ditch faces westwards, implying invading Saxons as its architects. Later, it formed a boundary of the Anglo-Saxon administrative division of Flendish Hundred. At a prominent point, the earthwork runs beside Mutlow Hill, crowned by a 4000-year-old Bronze Age burial mound.
Ashdon Meadows is a 1.5-hectare (3.7-acre) biological Site of Special Scientific Interest south of Ashdon in Essex.
Hales and Shadwell Woods is a 15.4-hectare (38-acre) biological Site of Special Scientific Interest north-east of Saffron Walden in Essex. Shadwell Wood has an area of 7.1 hectares and it is managed by the Essex Wildlife Trust. Hales Wood is a National Nature Reserve, and it is listed in the Nature Conservation Review.
West, Abbot's and Lound Woods is a 50.4-hectare (125-acre) biological Site of Special Scientific Interest south of Wittering in Cambridgeshire.
Madingley Wood is a 15.4-hectare (38-acre) biological Site of Special Scientific Interest near Madingley, on the western outskirts of Cambridge.
Brackland Rough is a 10.7-hectare (26-acre) biological Site of Special Scientific Interest in Fordham in Cambridgeshire. It is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire as Fordham Woods.
Little Paxton Wood is a 44.1-hectare biological Site of Special Scientific Interest west of Little Paxton in Cambridgeshire.
Aversley Wood is a 62.3 hectares biological Site of Special Scientific Interest south-west of Sawtry in Cambridgeshire. It is owned and managed by the Woodland Trust.
Eversden and Wimpole Woods is a 67.1-hectare (166-acre) biological Site of Special Scientific Interest between Kingston and Orwell in Cambridgeshire. The site has been designated a Special Area of Conservation for its barbastelle bats.
Hildersham Wood is a 7.7-hectare (19-acre) biological Site of Special Scientific Interest south of Hildersham in Cambridgeshire.
Langley Wood is a 31.6-hectare (78-acre) biological Site of Special Scientific Interest in Cambridgeshire, but lying between Saffron Walden in Essex and Haverhill in Suffolk.
Out and Plunder Woods is a 38.6-hectare (95-acre) biological Site of Special Scientific Interest between Great Bradley and Burrough Green in Cambridgeshire.
Carlton Wood is a 10.4-hectare (26-acre) biological Site of Special Scientific Interest on the eastern boundary of Cambridgeshire, and west of Great Bradley in Suffolk.
Valley Farm Pit, Sudbourne is a 0.5-hectare (1.2-acre) geological Site of Special Scientific Interest north of Orford in Suffolk. It is a Geological Conservation Review site, and in the Suffolk Coast and Heaths Area of Outstanding Natural Beauty.
Cavendish Woods is a 53.5-hectare (132-acre) biological Site of Special Scientific Interest north-west of Glemsford in Suffolk.
Cherry Hill and The Gallops, Barton Mills is a 10.4-hectare (26-acre) biological Site of Special Scientific Interest south of Barton Mills in Suffolk. It is a Nature Conservation Review site, Grade 2.
Hay Wood, Whepstead is a 10.4-hectare (26-acre) biological Site of Special Scientific Interest west of Whepstead in Suffolk.
