The Cotswold Water Park is the United Kingdom's largest marl lake system, straddling the Wiltshire–Gloucestershire border, northwest of Cricklade and south of Cirencester. There are 180 lakes, spread over 42 square miles (110 km2).
Fowlmere is a Royal Society for the Protection of Birds nature reserve between Fowlmere and Melbourn in Cambridgeshire. It is designated a 39.9 hectare biological Site of Special Scientific Interest called Fowlmere Watercress Beds.
Sevenoaks Gravel Pits is a 73.7-hectare (182-acre) biological Site of Special Scientific Interest on the northern outskirts of Sevenoaks in Kent. It is managed by Kent Wildlife Trust as the Sevenoaks Wildlife Reserve and Jeffery Harrison Visitor Centre.
Ingrebourne Marshes are a 74.8 hectare biological Site of Special Scientific Interest in Hornchurch in the London Borough of Havering. Ingrebourne Valley Local Nature Reserve includes a small part of the SSSI west of the River Ingrebourne. The site is managed by the Essex Wildlife Trust
Felmersham Gravel Pits is a 21.6 hectare Site of Special Scientific Interest between the villages of Felmersham and Sharnbrook in Bedfordshire. It was notified under Section 28 of the Wildlife and Countryside Act 1981 in 1986 and the local planning authority is Bedford Borough Council. The site is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire.
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.
Decoy Pit, Pools and Woods is a 17.7-hectare (44-acre) biological Site of Special Scientific Interest south of Aldermaston in Berkshire. An area of 8 hectares is a nature reserve called Decoy Heath, which is managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust.
Ruxley Gravel Pits is an 18.7-hectare (46-acre) biological Site of Special Scientific Interest in Ruxley, Orpington, in the London Borough of Bromley, and originally dug between 1929 and 1951. It is also a Site of Metropolitan Importance for Nature Conservation. It is owned by the Environment Agency and managed by Kent Wildlife Trust. Natural England has assessed its condition as "unfavourable recovering".
Castle Marshes is a 71 hectare nature reserve west of Lowestoft in Suffolk. It is managed by the Suffolk Wildlife Trust. It is part of the Barnby Broad and Marshes 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.
Titchmarsh Nature Reserve is a 72.7 hectare Local Nature Reserve north of Thrapston in North Northamptonshire. It is owned and managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire. It is part of the Upper Nene Valley Gravel Pits Site of Special Scientific Interest.
Higham Ferrers Pits is a 10 hectare nature reserve Northamptonshire. It is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire. It is part of the Upper Nene Valley Gravel Pits Site of Special Scientific Interest, Ramsar internationally important wetland site and Special Protection Area under the EC Birds Directive.
Richmond Farm Pit, Gedgrave is a 0.57-hectare (1.4-acre) geological Site of Special Scientific Interest south-west of Orford in Suffolk. It is a Geological Conservation Review site, and is in the Suffolk Coast and Heaths Area of Outstanding Natural Beauty.
Cavendish Woods is a 53.5-hectare (132-acre) biological Site of Special Scientific Interest north-west of Glemsford in Suffolk.
Kentwell Woods is a 77.6-hectare (192-acre) biological Site of Special Scientific Interest in fifteen woods in fourteen separate blocks east and north-east of Glemsford in Suffolk.
Crag Pit, Aldeburgh is a 0.2-hectare (0.49-acre) geological Site of Special Scientific Interest in Aldeburgh in Suffolk. It is a Geological Conservation Review site, and within the Suffolk Coast and Heaths Area of Outstanding Natural Beauty.
Round Hill Pit, Aldeburgh is a 0.5-hectare (1.2-acre) geological Site of Special Scientific Interest in Aldeburgh in Suffolk. It is a Geological Conservation Review site, and it is in the Suffolk Coast and Heaths Area of Outstanding Natural Beauty.
Leiston - Aldeburgh is a 534.8-hectare (1,322-acre) biological Site of Special Scientific Interest which stretches from Aldeburgh to Leiston in Suffolk. Part of it is The Haven, Aldeburgh Local Nature Reserve, and another area is the North Warren RSPB nature reserve. There is also a prehistoric bowl barrow on Aldringham Common, which is a Scheduled Monument. The site is in 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.
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.
St Leonard's Park Ponds is a 3.9-hectare (9.6-acre) biological Site of Special Scientific Interest east of Horsham in West Sussex.
Titchfield Haven is a 134.5-hectare (332-acre) biological Site of Special Scientific Interest north-west of Gosport in Hampshire. Most of it is a local nature reserve and a national nature reserve. It is part of Solent and Southampton Water Ramsar site and Special Protection Area.
