Aldbury Nowers is a 19.7 hectare

Hectare

The hectare is a metric unit of area defined as 10,000 square metres , and primarily used in the measurement of land. In 1795, when the metric system was introduced, the are was defined as being 100 square metres and the hectare was thus 100 ares or 1/100 km2...

 (48.7 acre) Biological Site of Special Scientific Interest in Dacorum

Dacorum

The Borough of Dacorum is a local government district in Hertfordshire, England that includes the towns of Hemel Hempstead, Berkhamsted, Tring and Kings Langley. The district, which was formed in 1974, had a population of 137,799 in 2001...

, in west Hertfordshire

Hertfordshire

Hertfordshire is a ceremonial and non-metropolitan county in the East region of England. The county town is Hertford.The county is one of the Home Counties and lies inland, bordered by Greater London , Buckinghamshire , Bedfordshire , Cambridgeshire and...

. The site was notified in 1990 under the Wildlife and Countryside Act 1981

Wildlife and Countryside Act 1981

The Wildlife and Countryside Act 1981 is an Act of Parliament in the United Kingdom and was implemented to comply with the Directive 2009/147/EC on the conservation of wild birds...

. The site, formerly known as "Duchie's Piece," comprises two areas of hillside, linked by The Ridgeway

The Ridgeway

thumb|right|thumb|The ancient tree-lined path winds over the downs countrysideThe Ridgeway is a ridgeway or ancient trackway described as Britain's oldest road...

. The site hosts the flowers of chalk grassland and has butterfly habitats with several different species of butterfly including the Hamearis lucina

Hamearis lucina

Hamearis lucina, known as the Duke of Burgundy, is a European butterfly in the family Riodinidae. For many years, it was known as the "Duke of Burgundy Fritillary", because of the adult's similar markings to "true" fritillaries of the family Nymphalidae.-Description:The male has a wingspan of , and...

, Theclinae

Theclinae

Subfamily Theclinae is a group of butterflies, including the hairstreaks, elfins and allies, in the family Lycaenidae. There are many tropical species as well as a number found in the Americas. Tropical hairstreaks often have iridescent blue coloration above, caused by reflected light from the...

 and the Essex Skipper

Essex Skipper

The Essex Skipper is a butterfly of the Hesperiidae family. In North America, it is known as the European Skipper....

. The site contains large amounts of woodland and calcareous grassland.

Northwest of the village of Aldbury

Aldbury

Aldbury is a village and civil parish in Hertfordshire, England, near the borders of Bedfordshire and Buckinghamshire, in a valley close to Ashridge Park. The nearest town is Tring; Tring railway station, 1 mile west, is in the parish of Aldbury...

, it adjoins the Pitstone

Pitstone

Pitstone is a village and civil parish within the Aylesbury Vale district of Buckinghamshire, England. It is located at the foot of the Chiltern Hills, about seven miles east of Aylesbury and six miles south of Leighton Buzzard...

 Hill NCR in Buckinghamshire and provides views over the Tring Gap and Vale of Aylesbury.