Upwood Meadows is a 6 hectare biological Site of Special Scientific Interest west of Upwood in Cambridgeshire. It is also a National Nature Reserve and a Grade I Nature Conservation Review site. It is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire.
Soham Wet Horse Fen is a 33.8-hectare (84-acre) biological Site of Special Scientific Interest east of Soham in Cambridgeshire. A 3.6-hectare (8.9-acre) field in the north-west corner is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire as Soham Meadow.
Woodwalton Fen is a 209-hectare biological Site of Special Scientific Interest in the parish of Woodwalton, west of Ramsey in Huntingdonshire, Cambridgeshire, England. It is a Ramsar wetland site of international importance, a National Nature Reserve, a Special Area of Conservation and a Nature Conservation Review site, Grade I. The site is managed by Natural England.
Cornard Mere is an 8.5-hectare (21-acre) biological Site of Special Scientific Interest in Little Cornard in Suffolk. It is managed by the Suffolk Wildlife Trust.
Debden Water SSSI is a 20.9-hectare (52-acre) biological Site of Special Scientific Interest which comprises two stretches of Debden Water, a small tributary of the River Cam, and surrounding land. The site is on the eastern outskirts of Newport in Essex, where the stream joins the Cam.
Thriplow Peat Holes is a 12.2-hectare (30-acre) biological Site of Special Scientific Interest north-east of Thriplow in Cambridgeshire.
Whitewater Valley is a 4.3-hectare (11-acre) biological Site of Special Scientific Interest north-west of Wittering in Cambridgeshire.
Alder Carr is a 6.7-hectare biological Site of Special Scientific Interest in Hildersham in Cambridgeshire.
L-Moor, Shepreth is a 6.6-hectare (16-acre) biological Site of Special Scientific Interest in Shepreth in Cambridgeshire. It is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire.
Delph Bridge Drain is a 0.15-hectare (0.37-acre) biological Site of Special Scientific Interest north-west of Soham in Cambridgeshire.
Chippenham Fen and Snailwell Poor's Fen is a 155.9-hectare (385-acre) biological Site of Special Scientific Interest south-east of Fordham in Cambridgeshire, England. It is a Nature Conservation Review site, Grade I, a Ramsar wetland site and a Special Area of Conservation. It is managed by Natural England.
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.
Berry Fen is a 15.3-hectare (38-acre) biological Site of Special Scientific Interest on the western outskirts of Earith in Cambridgeshire.
Wilbraham Fens is a 62.5-hectare (154-acre) biological Site of Special Scientific Interest east of Cambridge.
Cavenham–Icklingham Heaths is a 419 hectare biological Site of Special Scientific Interest west of Icklingham in Suffolk. It is a Nature Conservation Review site, Grade I, and part of Breckland Special Area of Conservation and Breckland Special Protection Area under the European Union Directive on the Conservation of Wild Birds. Cavenham Heath is a 203.1 hectare National Nature Reserve.
Bugg's Hole Fen is a 3.7-hectare (9.1-acre) biological Site of Special Scientific Interest north-west of Thelnetham in Suffolk.
Weston Fen is a 49.7-hectare (123-acre) biological Site of Special Scientific Interest in Hopton in Suffolk. It is part of the Waveney and Little Ouse Valley Fens Special Areas of Conservation, and an area of 37 hectares is managed as a nature reserve called Market Weston Fen by the Suffolk Wildlife Trust.
Boughton Fen is a 15.7-hectare (39-acre) biological Site of Special Scientific Interest east of Downham Market in Norfolk. it is common land registered to Boughton Parish Council.
Coston Fen, Runhall is a 7.1-hectare (18-acre) biological Site of Special Scientific Interest between Dereham and Wymondham in Norfolk. It is part of the Norfolk Valley Fens Special Area of Conservation.
