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 late 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. The entire length is now a Scheduled Monument and a 7.8-hectare (19-acre) biological Site of Special Scientific Interest.
Great Eastern Pingo Trail is a 9.2 kilometres long footpath along a disused railway line north of Thetford in Norfolk. It is a 4.2-hectare (10-acre) Local Nature Reserve, and it crosses three Sites of Special Scientific Interest, Thompson Water, Carr and Common, Breckland Forest and Cranberry Rough, Hockham. It also crosses Thompson Common, which is a nature reserve managed by the Norfolk Wildlife Trust and is a Nature Conservation Review site, Grade I. It further crosses Norfolk Valley Fens Special Area of Conservation and Breckland Special Protection Area.
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.
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.
St Neots Common is a 33.4-hectare (83-acre) biological Site of Special Scientific Interest in St Neots 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).
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.
Collyweston Great Wood and Easton Hornstocks is a 151.5 hectare biological Site of Special Scientific Interest north of King's Cliffe in Northamptonshire. The site is a National Nature Reserve and a Nature Conservation Review site, Grade I. The site is 14 kilometres (8.7 mi) west of Peterborough and the nearest villages are Collyweston, which is 1 kilometre (0.62 mi) north west of the site, and Duddington which is a similar distance to the west.
Wilbraham Fens is a 62.5-hectare (154-acre) biological Site of Special Scientific Interest east of Cambridge.
The Gardens, Great Ashfield is a 3.8-hectare (9.4-acre) biological Site of Special Scientific Interest north of Great Ashfield in Suffolk.
Norton Wood is a 24.8-hectare (61-acre) biological Site of Special Scientific Interest south-east of Norton in Suffolk, England.
Thorpe Morieux Woods is a 45.2-hectare (112-acre) biological Site of Special Scientific Interest north of Thorpe Morieux in Suffolk. Part of it is Bull's Wood, a nature reserve managed by the Suffolk Wildlife Trust.
Syderstone Common is a 43.7-hectare (108-acre) biological Site of Special Scientific Interest west of Fakenham in Norfolk. An area of 24-hectare (59-acre) is managed by the Norfolk Wildlife Trust
