Windsor Hill is a 61.8 hectare biological Site of Special Scientific Interest in Princes Risborough in Buckinghamshire. It lies within the Chilterns Area of Outstanding Natural Beauty, and it is featured in the Nature Conservation Review. A small part is managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust, and access to this area requires a permit.
Camp Down is a 7.3-hectare (18-acre) biological Site of Special Scientific Interest in Wiltshire in South West England. It was designated as such in 1965.
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
Woldingham and Oxted Downs is a 128.4-hectare (317-acre) biological Site of Special Scientific Interest east of Caterham in Surrey.
Totternhoe Knolls is a 13.1 hectare Site of Special Scientific Interest (SSSI) in Totternhoe in Bedfordshire. It is also a local nature reserve, and part of the Chilterns Area of Outstanding Natural Beauty. The site is owned by Central Bedfordshire Council and leased to the National Trust. Most of the site is maintained jointly by the National Trust and the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire (WTBCN), and is part of the WTBCN Totternhoe nature reserve, which also includes Totternhoe Chalk Quarry and Totternhoe Stone Pit. The SSSI also includes Totternhoe Castle, the earthworks of a Norman motte-and-bailey castle which is a Scheduled monument.
Totternhoe Chalk Quarry is a 13.4 hectare biological Site of Special Scientific Interest in Totternhoe in Bedfordshire. Part of it lies in Totternhoe nature reserve, which is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire. The site is part of the Chilterns Area of Outstanding Natural Beauty.
Deacon Hill SSSI is a 35.4 hectare biological Site of Special Scientific Interest in Pegsdon in Bedfordshire. It is in the Chilterns Area of Outstanding Natural Beauty, and it is part of the Pegsdon Hills and Hoo Bit nature reserve, managed by Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire.
Aston Rowant National Nature Reserve is located on the north-west escarpment of the Chiltern Hills, in the Chilterns Area of Outstanding Natural Beauty. It has an area of 159.1 hectares, and most of it is a 128.5 hectares biological Site of Special Scientific Interest. It is listed as a Grade 1 site in A Nature Conservation Review. The reserve is in several sections, mostly in the parish of Lewknor in Oxfordshire, with smaller sections in the parish of Stokenchurch in Buckinghamshire.
Hackpen, Warren & Gramp's Hill Downs is a 71.4-hectare (176-acre) biological Site of Special Scientific Interest in Letcombe Bassett in Oxfordshire.
Frogmore Meadows is a 4.6-hectare (11-acre) biological Site of Special Scientific Interest in Hertfordshire and Buckinghamshire, north of the village of Chenies. It consists of two meadows in the Chilterns Area of Outstanding Natural Beauty, next to the River Chess, one of which is a Hertfordshire and Middlesex Wildlife Trust nature reserve. The planning authorities are Three Rivers District Council, Dacorum Borough Council and Chiltern District Council.
Sarratt Bottom nature Reserve in Hertfordshire is a 3.2 hectare biological Site of Special Scientific Interest. The site is a meadow beside the River Chess. It is an example of damp grassland which has been traditionally managed for grazing. There are also areas of swamp and marsh. The main plants in grassland areas include sweet vernal grass and meadow foxtail, and marsh horsetail and common spike-rush are common in damper areas. The site has hedgehogs and a wide variety of wetland birds and invertebrates.
Gomm Valley is a 4.1-hectare (10-acre) biological Site of Special Scientific Interest in Micklefield, a district of High Wycombe in Buckinghamshire. It is managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust and is part of the Chilterns Area of Outstanding Natural Beauty. The local planning authority is Wycombe District Council.
Homefield Wood is a 6.1 hectare Site of Special Scientific Interest in Hambleden in Buckinghamshire. It is owned by the Forestry Commission, and managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust. It is part of the Chilterns Area of Outstanding Natural Beauty.
Dancersend Waterworks is a 4 hectare biological Site of Special Scientific Interest in Spencersgreen south of Aston Clinton in Buckinghamshire. It was formerly a private waterworks supplying the Rothschild Dancersend estate, and is now owned by Thames Water. It is in the Chilterns Area of Outstanding Natural Beauty. A cooling pond within the Thames Water site is a Grade II listed building.
Turville Hill is a 22.4 hectare biological Site of Special Scientific Interest in Turville in Buckinghamshire. It is in the Chilterns Area of Outstanding Natural Beauty. Cobstone Windmill, also known as Turville Windmill, is located at the top.
Fayland Chalk Bank is a 0.6 hectare Site of Special Scientific Interest in Parmoor, south of Lane End in Buckinghamshire. It is in the Chilterns Area of Outstanding Natural Beauty.
Frieth Meadows is a 2.5 hectare Site of Special Scientific Interest in Frieth in Buckinghamshire. It is in the Chilterns Area of Outstanding Natural Beauty.
Buttlers Hangings is a 3.9 hectare Site of Special Scientific Interest north of West Wycombe in Buckinghamshire. It is in the Chilterns Area of Outstanding Natural Beauty.
Aston Rowant Woods is a 209.7-hectare (518-acre) biological Site of Special Scientific Interest near Aston Rowant in Oxfordshire and Buckinghamshire. Part of it is in Aston Rowant National Nature Reserve, and a large part is in the Chiltern Beechwoods Special Area of Conservation. The site is also in the Chilterns Area of Outstanding Natural Beauty.
Temple Island Meadows is a 14.1-hectare (35-acre) biological Site of Special Scientific Interest on the Buckinghamshire bank of the River Thames. It is north of Henley-on-Thames and opposite Temple Island, an island in the Thames.
