Salisbury Plain
Coordinates: 51°09′18″N 1°48′32″W / 51.155°N 1.809°W
Salisbury Plain is a chalk plateau in central southern England covering 300 square miles (780 km2). It is part of a system of chalk downlands throughout eastern and southern England formed by the rocks of the Chalk Group and largely lies within the county of Wiltshire, with a little in Hampshire. The plain is famous for its rich archaeology, including Stonehenge, one of England's best known landmarks. Largely as a result of the establishment of the Defence Training Estate Salisbury Plain (DTE SP), the plain is sparsely populated and is the largest remaining area of calcareous grassland in north-west Europe. Additionally the plain has arable land, and a few small areas of beech trees and coniferous woodland. Its highest point is Easton Hill.
The boundaries of Salisbury Plain have never been truly defined, and there is some difference of opinion as to its exact area. The river valleys surrounding it, and other downs and plains beyond them loosely define its boundaries. To the north the scarp of the downs overlooks the Vale of Pewsey, and to the north west the Bristol Avon. The River Wylye runs along the south west, and the Bourne runs to the east. The Hampshire Avon runs through the eastern half of the plain and to the south the plain peters out as the river valleys close together before meeting at Salisbury. From here the Avon continues 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 is to the south west. In the west and north west the geology is mainly of the clays and limestones of the Blackmore Vale, Avon Vale and Vale of Wardour.
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