Arundel ( or ) is a market town and civil parish in a steep vale of the South Downs, West Sussex, England. It lies  SSW of London, WNW of the English Channel town of Brighton, and east of the county town of Chichester. Larger nearby towns include Worthing, Littlehampton and Bognor Regis. The much-conserved town with large green buffers has a medieval castle and Roman Catholic cathedral. Although smaller in population than most other parishes, Arundel has a museum and comes second behind much larger Chichester in its number of listed buildings in West Sussex. The River Arun runs through the eastern side of the town.