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Salisbury Plain is a 300 sq mi (780 km²)^[1] chalk plateau in central southern England, part of the Southern England Chalk Formation. Most of the plain lies within Wiltshire, with some in Berkshire. The plain is famous for its rich archaeology, including Stonehenge, one of England's best known landmarks. The plain is sparsely populated and is the largest remaining area of calcareous grassland in northwest Europe. Additionally the plain has several military institutions, arable land, and a few small areas of beech and coniferous woodland. The plain, and some of the surrounding area, is an Area of Outstanding Natural Beauty.

Durrington and Amesbury are the only large settlements on the plain, though there are a number of small villages, such as Chitterne, hamlets and army camps. The A303 road cuts across the plain, and a tunnel may be built to protect Stonehenge from the damage done by the huge volume of traffic which passes just metres from the site.^[2], however this is now seeming unlikely due to the expense of digging a tunnel and possible damage to the henge during the process due to vibrations.

The Plain has featured in the writings of William Wordsworth, Thomas Hardy, William Henry Hudson, and A.G. Street and in the paintings of Constable.

The plain is one of the Ministry of Defence and NATO's principal training grounds because of the sparse population. The plain is also home to the Defence Science and Technology Laboratory at Porton Down, much of whose work is secret. The Army Training Estate, Salisbury Plain (ATE SP) covers approximately 38,000 hectares (380 km², approx 150 sq mi) making it the largest military training area in the UK^[3].

Contents 1 Physical geography 2 History 3 See also 4 External links 5 Notes and references

The scarp of the downs is to the north overlooking the Vale of Pewsey. Its highest point is Walbury Hill in Berkshire, at 974ft (297 m) above sea level.^[4] The Wylye, Avon and Bourne valleys cut through the plain. They have narrow flood plains, steep sides, and relatively high population density. All three valleys flow down to Salisbury where the rivers meet, and flow south to the English Channel at Christchurch.

The Hampshire Downs and the Berkshire Downs are chalk downland to the east and north of Salisbury Plain, and the Dorset Downs and Cranborne Chase are to the southwest. In the west and northwest the geology is mainly of the clays and limestones of the Blackmore Vale, Avon Vale and Vale of Wardour. To the south is the New Forest.

Because of the large training areas inaccessible to the public, the plain is a wildlife haven, and home to two National Nature Reserves, but there is concern that the low level of grazing on the plain could allow scrub to encroach on the grassland. In 2003 the Great Bustard was reintroduced into Britain on Salisbury Plain.^[5]

Salisbury Plain is famous for its history. In Neolithic times there was an extensive population and much of the original vegetation had been cleared. The population was centred around the causeway camps of Whitesheet Hill and Robin Hood's Ball. By 2200 BC, Stonehenge and Avebury had become a focus for building, including a large quantity of round barrows and long barrows. Around 600 BC, large Bronze Age hill forts were constructed at Scratchbury and Battlesbury. Roman roads are visible features, probably serving a settlement near Old Sarum. Villas are sparse, however, and Anglo-Saxon place names suggest that the plain was mostly a grain producing imperial estate.

In the sixth century Anglo-Saxon incomers built planned settlements in the valleys surrounded by strip lynchets, with the downland left as sheep walks. To the south is the city of Salisbury, whose 13 and 14th century cathedral is famous for having the tallest spire in the country, and the building was, for centuries, the tallest building in Britain. The cathedral is evidence of the prosperity the wool and cloth trade bought to the area. In the post-Medieval period, the system of floated flood meadows was developed, and large manors and estates developed around Salisbury. In the mid-19th century the wool and cloth industry began to decline, leading to a decline in the population and change in land use from sheep farming to agriculture and military use. Wiltshire became one of the poorest counties in England during this period of decline. There are a number of chalk carvings on the plain, of which the most famous is the Westbury White Horse. The Kennet and Avon Canal runs to the north of the plain, through the Vale of Pewsey.

In 1896 George Kemp and Marconi experimented with wireless telegraphy on Salisbury Plain, and achieved good results over a distance of 1¾ miles.

• Geology of the United Kingdom
• Geology of Wiltshire
• British Army Training Unit Suffield

• The Countryside Agency: Salisbury Plain and West Wiltshire Downs AONB
• The Salisbury Plain Life Project
• The Ministry of Defence's Salisbury Plain information document
• William Wordsworth Poems on Salisbury Plain
• http://www.themodernantiquarian.com
• http://www.salisburyhere.co.uk loads of photos of Salisbury Plain.

1. ^ "Salisbury Plain", Encyclopaedia Britannica. Accessed 2006-02-11.
2. ^ Highways Agency, 2005. "A303 Stonehenge." Accessed 2006-02-11.
3. ^ http://www.army.mod.uk/ate/public/salisplain.htm
4. ^ "Walbury Hill", PeakBagger.com. Accessed 2006-02-11.
5. ^ James Owen, 2003. "Tall As a Deer, Huge U.K. Bird Staging a Comeback." National Geographic May 6, 2003.