Wiltshire (abbreviated Wilts) is a ceremonial county in the south west of England. It is landlocked and borders the counties of Dorset, Somerset, Hampshire, Gloucestershire, Oxfordshire and Berkshire. It contains the unitary authority of Swindon. The county covers 858,931 acres (3476 km²) Wiltshire is characterised by its high downland and wide valleys. Salisbury Plain is famous as the location of Stonehenge stone circle and other ancient landmarks. The city of Salisbury is notable for its cathedral.