The Blackwater Estuary is the estuary of the River Blackwater between Maldon and West Mersea in Essex. It is a 5,538 hectare biological Site of Special Scientific Interest (SSSI). An area of 4,395 hectares is also designated a Ramsar Wetland of International Importance, and a Special Protection Area 1,099 hectares is a National Nature Reserve. Tollesbury Wick and part of Abbotts Hall Farm, both nature reserve managed by the Essex Wildlife Trust, are in the SSSI.
Dengie nature reserve is a 12 sq. mi. biological and geological Site of Special Scientific Interest between the estuaries of the Blackwater and Crouch near Bradwell-on-Sea in Essex. It is also a National Nature Reserve, a Special Protection Area, a Nature Conservation Review site, a Geological Conservation Review site and a Ramsar site. It is part of the Essex estuaries Special Area of Conservation. An area of 30 acres is the Bradwell Shell Bank nature reserve, which is managed by the Essex Wildlife Trust.
Hastingford Cutting is a 0.04-hectare (0.099-acre) geological Site of Special Scientific Interest south of Crowborough in East Sussex. It is a Geological Conservation Review site.
Hornchurch Cutting is an 0.8-hectare geological Site of Special Scientific Interest in Hornchurch in the London Borough of Havering. It is also a Geological Conservation Review site.
The Crouch and Roach Estuaries are a 1729 hectare biological Site of Special Scientific Interest (SSSI) at the mouth of the Crouch and Roach rivers in Essex. The Crouch part of the SSSI stretches from near Battlesbridge to Foulness Island, and the Roach from Rochford to the junction with the Crouch. Part of the site is in the Mid-Essex Coast Special Protection Area under the EC Directive on the Conservation of Wild Birds, and a Ramsar wetland site of international importance. It is also part of the Essex Estuaries Special Area of Conservation. An area of 65 hectares is managed by the Essex Wildlife Trust as the Lion Creek and Lower Raypits nature reserve and 8 hectares at Woodham Fen, both of which are managed by the Essex Wildlife Trust. A small area is also a geological SSSI, The Cliff, Burnham-on-Crouch.
Hall's Quarry is a 0.8-hectare (2.0-acre) geological Site of Special Scientific Interest north-west of Ugley Green in Essex. It is a Geological Conservation Review site.
Globe Pit is a 0.4-hectare (0.99-acre) geological Site of Special Scientific Interest in Little Thurrock in Essex. It is a Geological Conservation Review site.
Ardleigh Gravel Pit is a 1.2-hectare (3.0-acre) geological Site of Special Scientific Interest south of Ardleigh in Essex. It is a Geological Conservation Review site.
Holland-on-Sea Cliff is a 0.1-hectare (0.25-acre) geological Site of Special Scientific Interest in Holland-on-Sea, north-west of Clacton-on-Sea in Essex. It is a Geological Conservation Review site.
St Osyth Pit is a 0.1-hectare (0.25-acre) geological Site of Special Scientific Interest north of St Osyth in Essex. It is a Geological Conservation Review site.
Harwich Foreshore is a 10.6-hectare (26-acre) geological Site of Special Scientific Interest in Harwich in Essex. It is a Geological Conservation Review site.
Marks Tey Brickpit is a 29.5-hectare (73-acre) geological Site of Special Scientific Interest in Marks Tey in Essex. It is a Geological Conservation Review site.
Lofts Farm Pit is a 4.5-hectare (11-acre) geological Site of Special Scientific Interest in Heybridge, a suburb of Maldon in Essex. It is a Geological Conservation Review site.
Goldsands Road Pit is a 1.3-hectare (3.2-acre) geological Site of Special Scientific Interest in Southminster in Essex. It is a Geological Conservation Review site.
Newney Green Pit is a 0.07-hectare (0.17-acre) geological Site of Special Scientific Interest west of Writtle in Essex. It is a Geological Conservation Review site.
The River Ter SSSI is a stretch of the River Ter and its banks south of Great Leighs in Essex which has been designated a geological Site of Special Scientific Interest. It is a Geological Conservation Review site.
Lion Pit is a 2.5-hectare (6.2-acre) geological Site of Special Scientific Interest in Grays in Essex. It is a Geological Conservation Review site, and part of the Chafford Gorges Nature Park, which is managed by the Essex Wildlife Trust.
Tiptree Heath is a 25 hectare biological Site of Special Scientific Interest south-west of Tiptree in Essex, England. It is managed by the Essex Wildlife Trust together with the Friends of Tiptree Heath.
Littlemore Railway Cutting is a 0.5-hectare (1.2-acre) geological Site of Special Scientific Interest on the southern outskirts of Oxford in Oxfordshire. It is a Geological Conservation Review site.
