Fleet Pond is a 48.3-hectare (119-acre) biological Site of Special Scientific Interest in Fleet in Hampshire. It is also a Local Nature Reserve.
Blenheim Park is a 224.3-hectare (554-acre) biological Site of Special Scientific Interest on the outskirts of Woodstock in Oxfordshire. It occupies most of the grounds of Blenheim Palace.
Ingrebourne Valley is a local nature reserve (LNR) in Hornchurch in the London Borough of Havering. It is owned and managed by Havering Council, and has a visitor centre managed by the Essex Wildlife Trust. Most of it is in Hornchurch Country Park west of the River Ingrebourne, but there are also areas north and south of the park which are part of the LNR. It has a wide range of habitats, including woodland, grassland, the river and marshes. It is an important site for a range of species of plants, animals and birds, including great crested newts, slow worms, the harvest mouse and the water vole.
Hatch Park is a 71.8-hectare (177-acre) biological Site of Special Scientific Interest east of Ashford in Kent. It is listed by Historic England on the Register of Historic Parks and Gardens of Special Historic Interest in England.
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
Lye Valley is a 2.3-hectare (5.7-acre) biological Site of Special Scientific Interest in Headington, a suburb of Oxford in Oxfordshire. It is part of the 4.5-hectare (11-acre) Lye Valley Local Nature Reserve, which is owned and managed by Oxford City Council.
Romney Warren or Romney Marsh is a 10.9-hectare (27-acre) country park and Local Nature Reserve in New Romney in Kent. It is owned by Folkestone and Hythe District Council and managed by the Romney Warren Project, which is a partnership between Folkestone and Hythe District Council, Romney Warren Charitable Trust, Kent Wildlife Trust and Romney Marsh Countryside Partnership. It is part of the Dungeness, Romney Marsh and Rye Bay Ramsar internationally important wetland site and Site of Special Scientific Interest.
Old Park Wood is a 16.7-hectare (41-acre) Site of Special Scientific Interest in Harefield in the London Borough of Hillingdon. The south-east part is an 8-hectare (20-acre) nature reserve owned and managed by the Hertfordshire and Middlesex Wildlife Trust.
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.
Danbury Ridge Nature Reserves are a group of nature reserves totalling 101 hectares near Danbury in Essex, England. They are managed by the Essex Wildlife Trust, and most of them are in Sites of Special Scientific Interest (SSSIs). Two areas, the Backwarden and Hitchcock's Meadow, are part of Danbury Common SSSI, and Woodham Walter Common, Birch Wood, Pheasanthouse Wood, Poors Piece, Scrubs Wood, and a small area in Pheasanthouse Farm, are part of Woodham Walter Common SSSI.
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.
Vange and Fobbing Marshes are a 164.6-hectare (407-acre) biological Site of Special Scientific Interest in two areas south of Basildon in Essex. Vange Marsh is managed by the Royal Society for the Protection of Birds.
Gernon Bushes is a 32 hectare nature reserve north-east of Epping in Essex. It is managed by the Essex Wildlife Trust. It is part of the Epping Forest Site of Special Scientific Interest and Nature Conservation Review site.
Buchan Hill Ponds is a 19.5-hectare (48-acre) biological Site of Special Scientific Interest on the south-west outskirts of Crawley in West Sussex.
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.
Eelmoor Marsh is a 66.3-hectare (164-acre) biological Site of Special Scientific Interest between Fleet and Farnborough in Hampshire. It is part of Thames Basin Heaths Special Protection Area for the conservation of wild birds.
Foxlease and Ancells Meadows is a 68.8-hectare (170-acre) biological Site of Special Scientific Interest on the western outskirts of Farnborough in Hampshire.The site is in seven areas, two of which are nature reserves managed by the Hampshire and Isle of Wight Wildlife Trust, Ancells Farm and Whitehouse Meadow.
