Holies Down is a 5.6-hectare (14-acre) biological Site of Special Scientific Interest south of Streatley in Berkshire. It is in the North Wessex Downs, which is an Area of Outstanding Natural Beauty and it is part of Lardon Chase, the Holies and Lough Down, three adjacent National Trust properties.
Boxford Water Meadows is a 13.9-hectare (34-acre) biological Site of Special Scientific Interest in Boxford in Berkshire. It is part of the Kennet & Lambourn Floodplain Special Area of Conservation.
Bray Meadows is a 6.6-hectare (16-acre) biological Site of Special Scientific Interest in Maidenhead in Berkshire.
Briff Lane Meadows is a 8.9-hectare (22-acre) biological Site of Special Scientific Interest north of Thatcham in Berkshire.
Bix Bottom is a 102.3-hectare (253-acre) biological Site of Special Scientific Interest north-west of Henley-on-Thames in Oxfordshire. It is owned and managed as Warburg Nature Reserve 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.
Reigate Heath is a 61.7-hectare (152-acre) biological Site of Special Scientific Interest west of Reigate in Surrey. An area of 51.6 hectares is also a Local Nature Reserve. Seven bowl barrows dating to the Bronze Age are designated Scheduled Monuments.
Seale Chalk Pit is a 1.2-hectare (3.0-acre) geological Site of Special Scientific Interest west of Guildford in Surrey. It is a Geological Conservation Review site and part of the Seale Chalk Pit and Meadow 3-hectare (7.4-acre) private nature reserve, which is managed by the Surrey Wildlife Trust.
Pegsdon Hills and Hoo Bit is a 79 hectare nature reserve in Pegsdon in Bedfordshire. It is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire. The site is on the border between Bedfordshire and Hertfordshire, and it covers Pegsdon Hills and part of the adjacent Deacon Hill in Bedfordshire, and Hoo Bit in Hertfordshire. It is in the Chilterns Area of Outstanding Natural Beauty, and part of the site is designated by Natural England as the Deacon Hill SSSI.
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.
Old Rectory Meadows is a 7.9 hectare Site of Special Scientific Interest in Denham in Buckinghamshire.
Long Herdon Meadow is a 4.5 hectare biological Site of Special Scientific Interest south of Marsh Gibbon in Buckinghamshire. It is part of Upper Ray Meadows nature reserve, which is managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust.
Poker's Pond Meadow is a 1.9 hectare biological Site of Special Scientific Interest south of Stoke Hammond in Buckinghamshire.
Easton Farm Meadow is a 1.6-hectare (4.0-acre) biological Site of Special Scientific Interest in Easton, west of Boxford in Berkshire. It is in the North Wessex Downs.
Marden Meadows is a 3.7-hectare (9.1-acre) biological Site of Special Scientific Interest east of Marden in Kent. Part of the site is in the 5.6-hectare (14-acre) Marden Meadow nature reserve, which is owned and managed by Kent Wildlife Trust.
Charleshill SSSI is a 10.1-hectare (25-acre) biological Site of Special Scientific Interest west of Elstead in Surrey. It is part of Thundry Meadows nature reserve, which is owned and managed by the Surrey Wildlife Trust
Woodsides Meadow is a 4-hectare (9.9-acre) nature reserve south of Wendlebury in Oxfordshire. It is managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust. It is part of Wendlebury Meads and Mansmoor Closes, which is a Site of Special Scientific Interest.
