Colne Estuary is a 2915 hectare biological and geological Site of Special Scientific Interest near Brightlingsea in Essex. It is also a Nature Conservation Review site, a National Nature Reserve, a Ramsar wetland site of international importance, a Special Protection Area, a Special Area of Conservation, and a Geological Conservation Review site. Three areas in the site are managed by the Essex Wildlife Trust, Colne Point, Fingringhoe Wick and Howlands Marsh.
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
Linder's Field is a 3.6 hectare Local Nature Reserve in Buckhurst Hill in Essex. It is owned and managed by Epping Forest District Council.
Roding Valley Meadows is an 18.9-hectare (47-acre) biological Site of Special Scientific Interest in Buckhurst Hill in Essex. It is part of a 65.2 hectare Local Nature Reserve with the same name, which is owned by Epping Forest District Council and Grange Farm Trust, and managed by the Essex Wildlife Trust.
Benfleet and Southend Marshes is an 8.1-square-mile (21 km2) Site of Special Scientific Interest (SSSI) in Essex. It consists of mudflats, salt marshes, scrub and wild grassland, and includes the Southend-on-Sea foreshore. It has been so recognised for its biological value, rather than geological. A definition five percent larger forms the Benfleet and Southend Marshes Ramsar site and Special Protection Area. In the centre-west, more than ten percent of the Site is the Leigh National Nature Reserve (NNR), which has been appraised in detail in A Nature Conservation Review as a site of national importance. The SSSI and NNR include the eastern half of Two Tree Island, in Leigh on Sea which is managed by the Essex Wildlife Trust. A narrow majority of the Site is the Southend on Sea Foreshore Local Nature Reserve.
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.
Vange Hill is an 11.5 hectare Local Nature Reserve in Vange, a suburb of Basildon in Essex. It is owned and managed by Basildon Borough Council.
Holland Haven Marshes is a 208.8-hectare (516-acre) biological Site of Special Scientific Interest north-east of Clacton-on-Sea in Essex. It is an L-shaped site which stretches along the coast from Frinton-on-Sea to Holland-on-Sea, and then north along the Holland Brook. It includes Holland Haven Country Park, a 22.1 hectare Local Nature Reserve owned and managed by Tendring District Council.
Whet Mead is a 10.1 hectare Local Nature Reserve in Witham in Essex. It is owned and managed by Braintree District Council.
Hockley Woods is a large woodland in south-east Essex. It is a Local Nature Reserve, and parts are a Site of Special Scientific Interest. It is owned and managed by Rochford District Council.
Stour Estuary is a 2,523 hectare biological and geological Site of Special Scientific Interest which stretches from Manningtree to Harwich in Essex and Suffolk. It is also an internationally important wetland Ramsar site, a Special Protection Area and a Nature Conservation Review site. It is part of the Suffolk Coast and Heaths Area of Outstanding Natural Beauty, and there are Geological Conservation Review sites in Wrabness, Stutton, and Harwich Part of the site is managed by the Royal Society for the Protection of Birds, and a small area is Wrabness Nature Reserve, a Local Nature Reserve managed by the Essex Wildlife Trust.
Hilly Fields is a 37.5 hectare Local Nature Reserve in Colchester, Essex. It is owned and managed by Colchester Borough Council. It is also a scheduled monument as it is in a late Iron Age site and Roman Camulodunum.
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.
Abbotts Hall Farm is a 282 hectare nature reserve in Great Wigborough in Essex. It is the head office of the Essex Wildlife Trust, which manages the site. It is also part of the Blackwater Estuary National Nature Reserve, Site of Special Scientific Interest, Ramsar site, Special Protection Area and Special Area of Conservation, It is an important archaeological site, and includes a Scheduled Monument, Great Wigborough henge.
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.
Pewley Down is a 9.5-hectare (23-acre) Local Nature Reserve on the southern outskirts of Guildford in Surrey, adjacent to Pewley Hill. It is owned and managed by Guildford Borough Council. The site is on a hill offering views south to St Martha's Hill, Chantry Wood, and beyond.
Watlington and Pyrton Hills is a 112.7-hectare (278-acre) biological Site of Special Scientific Interest east of Watlington in Oxfordshire. An area of 1.6 hectares is Watlington Chalk Pit, which is a Local Nature Reserve.
