Vale of Pewsey - Geography

Geography

The vale is an extent of lower lying ground separating the chalk downs of Salisbury Plain to the south from the Marlborough Downs to the north. It is around 30 kilometres (19 mi) long and around 5 kilometres (3.1 mi) wide. At the western end is the town of Devizes. Larger settlements in the vale include Pewsey and Burbage with many smaller villages, the larger ones including Bishops Cannings, Etchilhampton, Urchfont, Chirton, Alton Priors, Woodborough, Milton Lilbourne, Easton Royal and Wootton Rivers.

Although not itself part of the downs, the vale is included as part of the North Wessex Downs AONB (Area of Outstanding Natural Beauty).

The vale is a major east-west feature opening to the west towards the Bristol Channel, but is drained by the headwaters of the Salisbury Avon, rather than the westward-flowing Bristol Avon. The river cuts through the chalk scarp to the south at Upavon and crosses Salisbury Plain towards the south coast. The higher part of the eastern vale south of Burbage is drained by the River Bourne, which cuts the scarp at Collingbourne Kingston, joining the Avon at Salisbury. Since the area is not believed to have been glaciated, this probably indicates that the course of the rivers pre-dates the modern topography.

The highest point is Milk Hill (near Alton Barnes) at 295m / 968 ft above sea level, with the adjacent Tan Hill summiting at 294m / 965 ft.

The vale is not used by any major roads, but is followed by a railway and canal as a route between the London Basin and the west. To the north of Burbage the head of the Avon valley, draining west into the vale, meets the head of the River Dun, draining east to the Kennet and the Thames. The valley floor at around 150 metres (490 ft) above sea level provides a route through the downs which locally reach 200 to 300 metres. The Kennet and Avon Canal and the main line railway from London to the south-west make use of this route, the canal using the Bruce Tunnel. Formerly another rail route between Andover and Marlborough also followed this gap. Another line formerly branched off towards Bath via Devizes at the western end of the vale.