Combs Wood is a 15.1 hectares biological Site of Special Scientific Interest on the southern outskirts of Stowmarket in Suffolk. It is owned and managed by the Suffolk Wildlife Trust.
Sizewell Marshes form a 260-acre biological Site of Special Scientific Interest adjacent to Sizewell in Suffolk. It is in the Suffolk Coast and Heaths Area of Outstanding Natural Beauty, and is part of a 356-acre (144-ha) nature reserve managed by the Suffolk Wildlife Trust as Sizewell Belts.
Sutton and Hollesley Heaths is a 483.3-hectare (1,194-acre) biological Site of Special Scientific Interest south-east of Woodbridge in Suffolk. Most of the site is managed by the Suffolk Wildlife Trust as Sutton and Hollesley Commons. It is part of the Sandlings Special Protection Area under the European Union Directive on the Conservation of Wild Birds, and the Suffolk Coast and Heaths Area of Outstanding Natural Beauty.
Dew's Ponds is a 6.7-hectare (17-acre) biological Site of Special Scientific Interest (SSSI) south of Halesworth in Suffolk. It is a Special Area of Conservation.
Cavendish Woods is a 53.5-hectare (132-acre) biological Site of Special Scientific Interest north-west of Glemsford in Suffolk.
Newmarket Heath is a 279.3-hectare biological Site of Special Scientific Interest in Newmarket in Suffolk. It covers most of Newmarket Racecourse.
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.
Sandy Lane Pit, Barham is an 11.1-hectare (27-acre) geological Site of Special Scientific Interest west of Barham in Suffolk, England. It is a Geological Conservation Review site.
Snape Warren is a 48 hectare biological Site of Special Scientific Interest east of Snape in Suffolk. It is part of the Sandlings Special Protection Area under the European Union Directive on the Conservation of Wild Birds, and in the Suffolk Coast and Heaths Area of Outstanding Natural Beauty.
Sotterley Park is a 123.2-hectare (304-acre) biological Site of Special Scientific Interest in Sotterley in Suffolk. It is a Nature Conservation Review site, Grade I.
Titsal Wood, Shadingfield is a 14.7-hectare (36-acre) biological Site of Special Scientific Interest south-west of Shadingfield in Suffolk.
Tunstall Common is a 36.6 hectare biological Site of Special Scientific Interest east of Tunstall in Suffolk. It is part of the Sandlings Special Protection Area under the European Union Directive on the Conservation of Wild Birds, and the Suffolk Coast and Heaths Area of Outstanding Natural Beauty.
Weather and Horn Heaths, Eriswell is a 133.3-hectare (329-acre) 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
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.
Elmsett Park Wood is an 8.6-hectare (21-acre) biological Site of Special Scientific Interest east of Elmsett in Suffolk.
Sinks Valley is a 24.9-hectare (62-acre) biological Site of Special Scientific Interest in Kesgrave, on the eastern outskirts of Ipswich in Suffolk, United Kingdom.
Main Quarry or Castle Hill Quarry is a 14.7 hectares geological Site of Special Scientific Interest in Mountsorrel in Leicestershire. It is a Geological Conservation Review site.
Shotesham Common is a 21.6-hectare (53-acre) biological Site of Special Scientific Interest south of Norwich in Norfolk.
Sidestrand and Trimingham Cliffs is a 133.9-hectare (331-acre) biological and geological Site of Special Scientific Interest south-east of Cromer in Norfolk. It is a Geological Conservation Review site. It is in the Norfolk Coast Area of Outstanding Natural Beauty.
Decoy Carr, Acle is a 56-hectare (140-acre) biological Site of Special Scientific Interest south of Acle in Norfolk. It is part of the Broadland Ramsar site and Special Protection Area, and The Broads Special Area of Conservation.
