Knettishall Heath is a 91.7-hectare (227-acre) biological Site of Special Scientific Interest west of Knettishall in Suffolk. A larger area of 176 hectares is the Knettishall Heath Nature Reserve, which is managed by the Suffolk Wildlife Trust.
Suffolk Wildlife Trust (SWT) describes itself as the county's "nature charity – the only organisation dedicated wholly to safeguarding Suffolk's wildlife and countryside." It is a registered charity, and its headquarters is at Brooke House in Ashbocking, near Ipswich. It was founded in 1961, and is one of 46 wildlife trusts covering the Great Britain and Northern Ireland. As of March 2017, it has 13,200 members, and it manages 3,120 hectares of land in 60 nature reserves, most of which are open to the public. It had an income of £3.9 million in the year to 31 March 2017.
Lackford Lakes is a 105.8-hectare (261-acre) biological Site of Special Scientific Interest (SSSI) north and east of Lackford in Suffolk. The SSSI is part of the 131-hectare (320-acre) Lackford Lakes nature reserve, which is managed by the Suffolk Wildlife Trust.
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.
Newbourne Springs is a 15.7-hectare (39-acre) biological Site of Special Scientific Interest in Newbourne in Suffolk. It is owned by Anglian Water and managed by the Suffolk Wildlife Trust.
Groton Wood is a 20.2-hectare (50-acre) biological Site of Special Scientific Interest north-east of Groton in Suffolk. It is owned and managed by the Suffolk Wildlife Trust.
Bradfield Woods is an 81.4-hectare (201-acre) biological Site of Special Scientific Interest between Bury St Edmunds and Stowmarket in Suffolk. The site is in three separate blocks, the adjoining Felsham Hall and Monkspark Woods, and the much smaller separate Hedge Wood and Chensil Grove. Felsham Hall and Monkspark Woods are designated a 63.3 National Nature Reserve, also called Bradfield Woods, and are managed by the Suffolk Wildlife Trust.
Arger Fen is a 49.7-hectare (123-acre) biological Site of Special Scientific Interest (SSSI) south-east of Sudbury in Suffolk, England. The site occupies two separate areas. The 17.6-hectare (43-acre) Arger Fen Local Nature Reserve is part of the larger eastern block, and contains part of the 21-hectare (52-acre) Tiger Hill Local Nature Reserve, along with part of the 110-hectare (270-acre) Arger Fen and Spouse's Vale, a nature reserve managed by the Suffolk Wildlife Trust. The site lies in the Dedham Vale Area of Outstanding Natural Beauty,
Wangford Warren and Carr is a 67.8-hectare (168-acre) 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
Barnby Broad and Marshes is a Site of Special Scientific Interest (SSSI) in the Waveney district of the English county of Suffolk. The site is 189.6 hectares in size. It is in the parishes of North Cove and Barnby, located between Beccles and Lowestoft in the north of the county. The site is bordered on its southern edge by the East Suffolk railway line and to the north by the River Waveney. It is a Special Area of Conservation, a Special Protection Area under the EC Birds Directive, and a Ramsar internationally important wetland site. There are two Suffolk Wildlife Trust nature reserves in the site, Castle Marshes and North Cove.
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.
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.
Blo' Norton and Thelnetham Fens are a 21.3-hectare (53-acre) biological Site of Special Scientific Interest (SSSI) on the Norfolk/Suffolk border. Blo' Norton Fen is in the parish of Blo' Norton in Norfolk and Thelnetham Fen is in Thelnetham parish in Suffolk. It is a Nature Conservation Review site, Grade 2, and part of the Waveney and Little Ouse Valley Fens Special Area of Conservation, Thelnetham Fen is managed by the Suffolk Wildlife Trust and Blo' Norton Fen by the Little Ouse Headwaters Project (LOHP).
Sprat's Water and Marshes, Carlton Colville is a 57.1-hectare (141-acre) biological Site of Special Scientific Interest on the western outskirts of Lowestoft in Suffolk, England. It is part of the Broadland Ramsar internationally important wetland site, and Special Protection Area under the European Union Directive on the Conservation of Wild Birds, and part of The Broads Special Area of Conservation. The northern part of the site is Carlton Marshes, which is part of Carlton and Oulton Marshes, a nature reserve managed by the Suffolk Wildlife Trust.
Carlton and Oulton Marshes is a 151 hectare nature reserve in Lowestoft in Suffolk. It is managed by the Suffolk Wildlife Trust. Carlton Marshes is part of the Sprat's Water and Marshes, Carlton Colville Site of Special Scientific Interest, the Broadland Ramsar internationally important wetland site, the Broadland Special Protection Area under the European Union Directive on the Conservation of Wild Birds, and The Broads Special Area of Conservation.
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.
Potter and Scarning Fens, East Dereham is a 6.2-hectare (15-acre) biological Site of Special Scientific Interest south of Dereham in Norfolk. It is part of the Norfolk Valley Fens Special Area of Conservation. Scarning Fen is a Nature Conservation Review site, Grade I, and it is managed by the Norfolk Wildlife Trust.
