Wytham Woods is a 423.8-hectare (1,047-acre) biological Site of Special Scientific Interest north-west of Oxford in Oxfordshire. It is a Nature Conservation Review site.
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.
Blackwater Valley is a 33.9-hectare (84-acre) biological Site of Special Scientific Interest between Sandhurst in Berkshire and Blackwater in Hampshire.
Avery's Pightle is a 1.3-hectare (3.2-acre) biological Site of Special Scientific Interest south of Enborne in Berkshire. It is managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust.
Chimney Meadows is a 49.6-hectare (123-acre) biological Site of Special Scientific Interest between Abingdon-on-Thames and Faringdon in Oxfordshire. It is also a National Nature Reserve, and part of the 308-hectare (760-acre) Chimney Meadows nature reserve, which is managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust.
Lingfield Cernes is a 10.3-hectare (25-acre) biological Site of Special Scientific Interest east of Lingfield in Surrey.
Frays Farm Meadows is a 28.2-hectare (70-acre) biological Site of Special Scientific Interest near Denham in the London Borough of Hillingdon. It was notified as an SSSI in 1981, and has been managed by the London Wildlife Trust on behalf of Hillingdon Council since 1999. It is part of the Colne Valley Regional Park.
Tingewick Meadows is an 11.1 hectare biological Site of Special Scientific Interest south of Tingewick in Buckinghamshire.
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
Otmoor SSSI is a 213-hectare (530-acre) biological Site of Special Scientific Interest north of Oxford in Oxfordshire. It is adjacent to RSPB Otmoor, and they are both part of Otmoor, an area of wetland and wet grassland which was enclosed in the early nineteenth century.
Whitecross Green and Oriel Woods is a 63-hectare (160-acre) biological Site of Special Scientific Interest between Oxford and Bicester in Oxfordshire. It is owned and managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust under the name Whitecross Green Wood.
Bere Mill Meadows is a 10.3-hectare (25-acre) biological Site of Special Scientific Interest east of Whitchurch in Hampshire.
Bransbury Common is a 158.6-hectare (392-acre) biological Site of Special Scientific Interest south-east of Andover in Hampshire. It is a Nature Conservation Review site, Grade I.
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.
Quarley Hill Fort is a 3.5-hectare (8.6-acre) biological Site of Special Scientific Interest west of Grateley in Hampshire.
Ducklington Mead is a 4.6-hectare (11-acre) biological Site of Special Scientific Interest east of Ducklington in Oxfordshire.
Little Tew Meadows is a 40-hectare (99-acre) biological Site of Special Scientific Interest east of Chipping Norton in Oxfordshire.
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.
