Two Tree Island is a small island lying north-east of Canvey Island and south-west of Leigh-on-Sea in Essex, England. It covers 257 hectares and is connected to the mainland at Leigh by a single span bridge.
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.
Bridgemarsh Island is in the tidal part of the River Crouch in the English county of Essex, three miles upstream from Burnham-on-Crouch. The main river channel runs to the south between the island and Canewdon, and it is separated from the mainland to the north by Bridgemarsh and Althorne Creeks, channels of the estuary.
Aldbury Nowers is a 19.7 hectares biological Site of Special Scientific Interest (SSSI) in the Chiltern Hills, north-east of Tring in Hertfordshire. The site was notified in 1990 under the Wildlife and Countryside Act 1981. It is managed by the Hertfordshire and Middlesex Wildlife Trust.
Ray Island, also known as the Ray, is a 40.5-hectare (100-acre) nature reserve west of Mersea Island in Essex. The site is a sandy hill rising out of an area of saltmarsh between Strood Channel and Ray Channel. The island is owned by the National Trust, who bought it in 1970. It was leased by the National Trust to the Essex Wildlife Trust, which managed the site. Following the cessation of the lease, the National Trust has resumed responsibility for the island's management.
Sawbridgeworth Marsh is a 6.3-hectare (16-acre) biological Site of Special Scientific Interest (SSSI) near Sawbridgeworth in Hertfordshire, apart from a small area in the north which is in Essex. It is managed by the Essex Wildlife Trust. The planning authorities are East Hertfordshire District Council and Uttlesford District Council.
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.
Foulness SSSI is a 10,702 hectare biological Site of Special Scientific Interest covering the shoreline between Southend-on-Sea and the Crouch estuary in Essex.
Great Wood and Dodd's Grove is a 36.8-hectare (91-acre) biological Site of Special Scientific Interest in Leigh-on-Sea in Essex. It is also a Local Nature Reserve called Belfairs. Essex Wildlife Trust runs the Belfairs Woodland Centre and manages the site together with Southend-on-Sea City Council.
Hamford Water is a 2,185.8-hectare (5,401-acre) biological Site of Special Scientific Interest between Walton-on-the-Naze and Harwich in Essex. The site is a tidal inlet which has marsh grasslands, creeks, mud and sand flats, salt marshes, islands and beaches. It is described by Natural England as "of international importance for breeding little terns and wintering dark-bellied brent geese, wildfowl and waders, and of national importance for many other bird species." Rare plants include hog's fennel and slender hare's-ear. The main invertebrates are worms and thin-shelled molluscs. The largest island, Horsey Island, can be reached on foot at low tide across The Wade from Kirby-le-Soken.
Weeleyhall Wood is a 31 hectare biological Site of Special Scientific Interest north of Clacton-on-Sea in Essex. It is managed by the Essex Wildlife Trust.
Canvey Lake is an 8.3 hectare Local Nature Reserve in Canvey Island in Essex. It is owned by Castle Point Borough Council and managed by the council together with Canvey Island Town Council.
Wrabness Nature Reserve is a 27 hectare Local Nature Reserve on the south bank of the River Stour, west of Wrabness in Essex. It is managed by the Essex Wildlife Trust.
Bradwell Shell Bank is a nature reserve on the coast of the Dengie Peninsula near Bradwell-on-Sea in Essex. It is managed by the Essex Wildlife Trust. It is part of the Dengie Site of Special Scientific Interest, Special Protection Area and Ramsar site, and the Essex Estuaries Special Area of Conservation. It is also part of the Blackwater Flats and Marshes, a Grade I site in the Nature Conservation Review.
Howlands Marsh is a 29.9-hectare (74-acre) nature reserve north-east of St Osyth in Essex. It is managed by the Essex Wildlife Trust. It is part of the Colne Estuary Site of Special Scientific Interest Special Protection Area and Ramsar site, and the Blackwater Flats and Marshes Nature Conservation Review site.
Langdon Nature Reserve is a 210 hectare nature reserve west of Basildon in Essex. It is managed by the Essex Wildlife Trust, and forms part of the Langdon Ridge Site of Special Scientific Interest.
Lion Creek and Lower Raypits is a 65.2-hectare (161-acre) nature reserve east of Canewdon in Essex. It is part of the Crouch and Roach Estuaries Site of Special Scientific Interest, and is owned and managed by the Essex Wildlife Trust.
Tollesbury Wick is a 242.8-hectare (600-acre) nature reserve east of Tollesbury in Essex. It is managed by the Essex Wildlife Trust.
Broughton Down is a 45.8-hectare (113-acre) biological Site of Special Scientific Interest west of Broughton in Hampshire. The eastern half is a nature reserve managed by the Hampshire and Isle of Wight Wildlife Trust.
