Wiltshire is a ceremonial county in South West England. It is landlocked and borders the counties of Dorset, Somerset, Hampshire, Gloucestershire, Oxfordshire and Berkshire. It contains the unitary authority of Swindon and covers 3,485 km . The ancient county town was Wilton, but since 1930 Wiltshire County Council and its successor Wiltshire Council (from 2009) have been based at Trowbridge. Wiltshire is characterised by its high downland and wide valleys.