Deben Estuary is a 981.1 hectare biological Site of Special Scientific Interest (SSSI) covering the River Deben and its banks 12 kilometres from its mouth north of Felixstowe to Woodbridge in Suffolk. It is a Ramsar internationally important wetland site and a Special Protection Area under the European Union Directive on the Conservation of Wild Birds. It is also in the Suffolk Coast and Heaths Area of Outstanding Natural Beauty. It partly overlaps two geological SSSIs, Ferry Cliff, Sutton and Ramsholt Cliff.
Rex Graham Reserve is a 2.8 hectare biological Site of Special Scientific Interest east of Mildenhall in Suffolk. It is a Special Area of Conservation, and part of the Breckland Special Protection Area. It was formerly managed by the Suffolk Wildlife Trust.
Foxhole Heath is an 85.2 hectare biological Site of Special Scientific Interest east of Eriswell 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.
Wangford Warren and Carr is a 67.8 hectare biological Site of Special Scientific Interest between Brandon and Lakenheath in Suffolk. It is a Nature Conservation Review site, Grade I, and part of the Breckland Special Area of Conservation, and Special Protection Area An area of 15 hectares is managed as a nature reserve by the Suffolk Wildlife Trust
Berner's Heath is a 236.9 hectare biological Site of Special Scientific Interest north-east of Icklingham in Suffolk. It is a Nature Conservation Review site, a Special Area of Conservation, and a Special Protection Area
Barnham Heath is a 78.6 hectare biological Site of Special Scientific Interest near Barnham, a village south of Thetford in Suffolk. It is a Nature Conservation Review site, Grade 2, and part of the Breckland Special Protection Area under the European Union Directive on the Conservation of Wild Birds
Breckland Forest is an 18,126 hectare biological and geological Site of Special Scientific Interest in many separate areas between Swaffham in Norfolk and Bury St Edmunds in Suffolk. It is part of the Breckland Special Protection Area under the European Union Directive on the Conservation of Wild Birds. It contains two Geological Conservation Review sites, Beeches Pit, Icklingham and High Lodge. Barton Mills Valley is a Local Nature Reserve in the south-west corner of the site.
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.
Deadman's Grave, Icklingham is a 127.3 hectare biological Site of Special Scientific Interest north-east 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.
Lakenheath Warren is a 588.3 hectare biological Site of Special Scientific Interest south-east of Lakenheath in Suffolk, England. 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.
Little Heath, Barnham is a 46.2 hectare biological Site of Special Scientific Interest south-west of Barnham in Suffolk. It is a Nature Conservation Review site, Grade I, and part of the Breckland Special Protection Area under the European Union Directive on the Conservation of Wild Birds
Eriswell Low Warren is a 7.4 hectare biological Site of Special Scientific Interest north-east of Eriswell in Suffolk. It is a Nature Conservation Review site, Grade I, and part of the Breckland Special Protection Area under the European Union Directive on the Conservation of Wild Birds.
Sandlings Forest is a 2,483.8 hectare biological Site of Special Scientific Interest in two large blocks, Rendlesham Forest and Tunstall Forest, and two small ones, between Woodbridge and Aldeburgh in Suffolk. It is partly in the Sandlings Special Protection Area under the European Union Directive on the Conservation of Wild Birds. It is in the Suffolk Coast and Heaths Area of Outstanding Natural Beauty.
How Hill Track is a 3.1 hectare biological Site of Special Scientific Interest east of Mildenhall in Suffolk. It is in the Breckland Special Protection Area under the European Union Directive on the Conservation of Wild Birds.
Thetford Heaths is a 270.6 hectare biological and geological Site of Special Scientific Interest in Suffolk. It is a Nature Conservation Review site, Grade I, and parts of it are a National nature reserve, and a Geological Conservation Review, It is part of the Breckland Special Area of Conservation, and Special Protection Area A large part of this dry heathland site is calcareous grassland, and some areas are grazed by sheep or rabbits. There are several nationally rare plants and an uncommon heathland bird, and many lichens and mosses.
Weather and Horn Heaths, Eriswell is a 133.3 hectare biological Site of Special Scientific Interest east of Eriswell in Suffolk. It is a Nature Conservation Review site, Grade I, and part of the Breckland Special Area of Conservation, and Special Protection Area
West Stow Heath is a 44.3 hectare biological Site of Special Scientific Interest west of West Stow in Suffolk. It is part of the Breckland Special Protection Area under the European Union Directive on the Conservation of Wild Birds.
Barnham Cross Common is a 69.1-hectare (171-acre) biological Site of Special Scientific Interest on the southern outskirts of Thetford in Norfolk. It is owned by Thetford Town Council and is registered common land. It is also a Local Nature Reserve and a Nature Conservation Review site, Grade 1. It is part of the Breckland Special Area of Conservation and Special Protection Area.
Stanford Training Area SSSI is part of the British Army Stanford Training Area. It is a 4,678-hectare (11,560-acre) biological and geological Site of Special Scientific Interest north of Thetford in Norfolk. It is a Nature Conservation Review site and part of it is a Geological Conservation Review site. It is also part of the Breckland Special Area of Conservation and Special Protection Area.
