Fleam Dyke is a linear earthwork between Fulbourn and Balsham in Cambridgeshire, initiated some time 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.
Waresley and Gransden Woods is a 50-hectare (120-acre) nature reserve between Waresley and Great Gransden in Cambridgeshire, England. It is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire. The site is a 54.2-hectare (134-acre) biological Site of Special Scientific Interest called Waresley Wood, with slightly different boundaries.
Castor Hanglands is an 89.8-hectare (222-acre) biological Site of Special Scientific Interest west of Peterborough in Cambridgeshire. The site is also a National Nature Reserve, and it is a Nature Conservation Review site, Grade I for its woodlands and Grade 2 for its grassland. It is common land managed by Natural England.
Thompson Water, Carr and Common is a 154.7-hectare (382-acre) biological Site of Special Scientific Interest north of Thetford in Norfolk. Most of it is managed by the Norfolk Wildlife Trust as Thompson Common. It is a Nature Conservation Review site, Grade I, and part of the Norfolk Valley Fens Special Area of Conservation. It is crossed by the Great Eastern Pingo Trail Local Nature Reserve.
Nunn Wood is a 9.7-hectare (24-acre) biological Site of Special Scientific Interest between Great Chesterford and Ashdon in Essex, England.
Sawston Hall Meadows is a 7.4-hectare (18-acre) biological Site of Special Scientific Interest in Sawston in Cambridgeshire.
Godmanchester Eastside Common is a 29.7-hectare (73-acre) biological Site of Special Scientific Interest east of Godmanchester in Cambridgeshire. The site is registered common land.
Great Stukeley Railway Cutting is a 34.7-hectare (86-acre) biological Site of Special Scientific Interest in Huntingdon in Cambridgeshire.
Hemingford Grey Meadow is a 0.7-hectare (1.7-acre) biological Site of Special Scientific Interest south of Hemingford Grey in Cambridgeshire. It is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire as Arthur's Meadow.
Upware North Pit is a 1.1-hectare (2.7-acre) biological Site of Special Scientific Interest north-west of Wicken in Cambridgeshire.
St Neots Common is a 33.4-hectare (83-acre) biological Site of Special Scientific Interest in St Neots in Cambridgeshire.
Hildersham Wood is a 7.7-hectare (19-acre) biological Site of Special Scientific Interest south of Hildersham in Cambridgeshire.
Little Paxton Pits is a 127.4-hectare (315-acre) biological Site of Special Scientific Interest in Little Paxton in Cambridgeshire. Part of it is also a 60 hectare Local Nature Reserve (LNR).
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.
Stow-Cum-Quy Fen is a 29.9-hectare (74-acre) biological Site of Special Scientific Interest west of Lode in Cambridgeshire. Most of it is common land.
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.
Wilbraham Fens is a 62.5-hectare (154-acre) biological Site of Special Scientific Interest east of Cambridge.
Bangrove Wood is an 18.6-hectare (46-acre) biological Site of Special Scientific Interest north of Ixworth in Suffolk, England.
Cockthorpe Common, Stiffkey is a 7.1-hectare (18-acre) biological Site of Special Scientific Interest east of Wells-next-the-Sea in Norfolk. It is in the Norfolk Coast Area of Outstanding Natural Beauty.
