The Roman Catholic Diocese of Clifton is a Roman Catholic diocese centred on the Cathedral Church of Saints Peter and Paul in Clifton, England. The diocese covers the City and County of Bristol and the ceremonial counties of Gloucestershire, Somerset, and Wiltshire, an area of 4,215 square miles (10,920 km2). Thus it stretches from Stow in the Wold in the north to Minehead and Watchet in the South. The most north-westerly parishes are in the Forest of Dean, while Marlborough near Swindon is one of the most easterly. The City of Bristol, of which Clifton is a suburb, is the largest centre of population within the Diocese; Swindon is the next biggest. Other well-known cities and towns include Bath, Wells, Cheltenham, Gloucester, Salisbury, Taunton and Weston-super-Mare.