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.
Hartslock is a 41.8-hectare (103-acre) biological Site of Special Scientific Interest south-east of Goring-on-Thames in Oxfordshire. An area of 29.4 hectares is a Special Area of Conservation and an area of 10 hectares is a nature reserve owned and managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust,
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.
Bacombe and Coombe Hills is a 76.4 hectare biological Site of Special Scientific Interest in Upper Bacombe in Buckinghamshire. Bacombe Hill was formerly owned by Buckinghamshire County Council, which transferred it to Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust in 2014. Coombe Hill is owned by the National Trust.
Gomm Valley is a 4.1 hectare 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.
Grangelands and Pulpit Hill is a 25.5 hectare biological Site of Special Scientific Interest in Cadsden in Buckinghamshire. It lies within the Chilterns Area of Outstanding Natural Beauty, and the planning authorities are Wycombe District Council and Buckinghamshire County Council.
Hollowhill and Pullingshill Woods is a 23-hectare biological Site of Special Scientific Interest near Marlow in Buckinghamshire. It is in the Chilterns Area of Outstanding Natural Beauty, and the Chilterns Beechwoods Special Area of Conservation. The local planning authorities are Wycombe District Council and Buckinghamshire County Council. Pullingshill Wood is owned by the Woodland Trust, and Hollowhill Wood was formerly owned by Buckinghamshire County Council, but was transferred to the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust. Since November 2015 the 7.8-hectare site has been managed by the Trust as "Hog and Hollowhill Woods".
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.
College Lake is a 65 hectare nature reserve in a former chalk quarry in Pitstone in the Aylesbury Vale district of Buckinghamshire. It is one of the flagship reserves of the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust, and it has an information centre, education facilities, a café, toilets and a shop. It is in the Chilterns Area of Outstanding Natural Beauty. The area east of the lake is a geological Site of Special Scientific Interest called Pitstone Quarry.
Aston Clinton Ragpits is a 2.9 hectare biological Site of Special Scientific Interest in Aston Clinton in Buckinghamshire. It is a former chalk quarry, which is now a nature reserve managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust. It is in the Chilterns Area of Outstanding Natural Beauty.
Dancersend is an 81.3 hectare Site of Special Scientific Interest (SSSI) south of Aston Clinton in Buckinghamshire. Part of the site is managed by the Forestry Commission and part by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust (BBOWT). The BBOWT's 47 hectare nature reserve, called Dancersend with Pavis Woods, extends into fields west of the SSSI. It is in the Chilterns Areas of Outstanding Natural Beauty.
Millfield Wood is a 9.5 hectare biological Site of Special Scientific Interest north of High Wycombe in Buckinghamshire. It is owned and managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust, and it is in the Chilterns Areas of Outstanding Natural Beauty.
Swain's Wood is a 16.2 hectare biological Site of Special Scientific Interest west of Turville in Buckinghamshire. It is in the Chilterns Area of Outstanding Natural Beauty, and is managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust.
Long Grove Wood is a 1.5 hectare nature reserve managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust in Seer Green in Buckinghamshire.
Rushbeds Wood is a 56 hectare nature reserve near Wotton Underwood in Buckinghamshire, managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust (BBOWT). It is a surviving fragment of the ancient Bernwood Forest. The reserve is part of Rushbeds Wood and Railway Cutting, an 80.2 hectare biological Site of Special Scientific Interest. This includes a section of the Chiltern Main Line railway cutting, which runs along the north-east side of the BBOWT reserve.
Haymill Valley is a 7.8-hectare (19-acre) Local Nature Reserve in Slough in Berkshire. It is owned by Slough Borough Council and managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust. The site is known locally as The Millie.
Hurley Chalk Pit is a 1-hectare (2.5-acre) nature reserve west of Maidenhead in Berkshire. It is managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust.
Oakley Hill is a 13-hectare (32-acre) nature reserve south of Chinnor in Oxfordshire. It is managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust.
