Wiltshire is a ceremonial county in South West England. It borders Gloucestershire to the north, Oxfordshire to the north-east, Berkshire to the east, Hampshire to the south-east, Dorset to the south, and Somerset to the west. The largest settlement is Swindon, and Trowbridge is the county town.

South West England, or the South West of England, is one of the nine official regions of England in the United Kingdom. It consists of the counties of Cornwall, Dorset, Devon, Gloucestershire, Somerset and Wiltshire. Cities and large towns in the region include Bath, Bristol, Bournemouth, Cheltenham, Exeter, Gloucester, Plymouth and Swindon. It is geographically the largest of the nine regions of England with a land area of 9,203 square miles (23,836 km2), but the third-least populous, with approximately 5.7 million residents.