River Avon System is a 475.9-hectare (1,176-acre) biological Site of Special Scientific Interest in Hampshire and Wiltshire, southern England. It is a Nature Conservation Review site, Grade I. It is part of the Avon Valley and New Forest Ramsar sites and is also part of two Special Protection Areas: Solent and Southampton Water, and the New Forest.
Hunsdon Mead is a 34 hectare biological Site of Special Scientific Interest (SSSI) west of Harlow and east of Roydon in Essex. The site is partly in Essex and partly in Hertfordshire, and it is jointly owned and managed by the Essex Wildlife Trust and the Herts and Middlesex Wildlife Trust. The SSSI also includes part of the neighbouring Roydon Mead. The planning authorities are East Hertfordshire District Council and Epping Forest District Council. Hunsdon Mead is registered common land.
Wendlebury Meads and Mansmoor Closes is a 73.2-hectare (181-acre) biological Site of Special Scientific Interest south of Wendlebury in Oxfordshire.
Aston Upthorpe Downs is a 38.5-hectare (95-acre) biological Site of Special Scientific Interest south of Aston Upthorpe in Oxfordshire. It is a Nature Conservation Review site, Grade I.
Sheep's Banks is a 5.1-hectare (13-acre) biological Site of Special Scientific Interest north of Wootton in Oxfordshire.
Iffley Meadows is a 36.1-hectare (89-acre) biological Site of Special Scientific Interest in Oxford in Oxfordshire. It is owned by Oxford City Council and managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust
Little Wittenham SSSI is a 68.9-hectare (170-acre) biological Site of Special Scientific Interest north-east of Didcot in Oxfordshire. It is also a Special Area of Conservation.
Out Wood is a 19.2-hectare (47-acre) biological Site of Special Scientific Interest east of Charlbury in Oxfordshire.
Pixey and Yarnton Meads is an 86.4-hectare (213-acre) biological Site of Special Scientific Interest north of Oxford in Oxfordshire. It is a Nature Conservation Review site, Grade I, and part of Oxford Meadows Special Area of Conservation.
Wolvercote Meadows is a 7.1-hectare (18-acre) biological Site of Special Scientific Interest north of Oxford in Oxfordshire. Part of it is owned by the Oxford Preservation Trust. It is part of Oxford Meadows Special Area of Conservation.
Chilbolton Common is a 35.5-hectare (88-acre) biological Site of Special Scientific Interest in Chilbolton in Hampshire.
Coombe Wood and The Lythe is a 44-hectare (110-acre) biological Site of Special Scientific Interest west of Bordon in Hampshire. It is part of East Hampshire Hangers Special Area of Conservation and Combe Wood is a National Trust property.
Greywell Fen is a 38-hectare (94-acre) biological Site of Special Scientific Interest in Greywell in Hampshire. It is a Nature Conservation Review site, Grade 2, and an area of 13 hectares is a nature reserve called Greywell Moors, which is managed by the Hampshire and Isle of Wight Wildlife Trust.
Highclere Park is a 69.6-hectare (172-acre) biological Site of Special Scientific Interest east of Highclere in Hampshire. It is the park of Highclere Castle and is Grade 1 on the Register of Historic Parks and Gardens of Special Historic Interest in England.
Stockbridge Common Marsh is a 64.8-hectare (160-acre) biological Site of Special Scientific Interest south of Stockbridge in Hampshire. It is owned by the National Trust.
Wealden Edge Hangers is a 222.4-hectare (550-acre) biological Site of Special Scientific Interest north of Petersfield in Hampshire. An area of 48 hectares is Wealden Edge Hangers Local Nature Reserve and an area of 144.1 hectares is Ashford Hangers National Nature Reserve. Wealden Edge Hangers is part of the East Hampshire Hangers Special Area of Conservation.
Bould Wood is a 58.2-hectare (144-acre) biological Site of Special Scientific Interest north of Shipton-under-Wychwood in Oxfordshire. An area of 23 hectares is Foxholes nature reserve, which is managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust.
Warren Bank is a 3.1-hectare (7.7-acre) biological Site of Special Scientific Interest south-east of Wallingford in Oxfordshire. It is managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust.
Wytham Ditches and Flushes is a 2.7-hectare (6.7-acre) biological Site of Special Scientific Interest north of Oxford in Oxfordshire.
