South West England, or the South West of England, is one of the nine official regions of England in the United Kingdom. Additionally, it is one of four regions that altogether make up Southern England. South West England consists of the counties of Cornwall (including the Isles of Scilly), Dorset, Devon, Bristol, 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 km), but the third-least populous, with an estimated 5,889,695 residents in 2024.
The region includes the West Country and much of the ancient kingdom of Wessex. It includes two entire national parks, Dartmoor and Exmoor (a small part of the New Forest is also within the region); and four World Heritage Sites: Stonehenge, the Cornwall and West Devon Mining Landscape, the Jurassic Coast and the City of Bath. The northern part of Gloucestershire, near Chipping Campden, is as close to the Scottish border as it is to the tip of Cornwall. The region has by far the longest coastline of any English region.