Horsham is a market town with a population of 55,657 (2008) on the upper reaches of the River Arun in the centre of the Weald, West Sussex, in the historic County of Sussex, England. The town is 31 miles south south-west of London, 18.5 miles north-west of Brighton and 26 miles north-east of the county town of Chichester. Nearby towns include Crawley to the north-east and Haywards Heath and Burgess Hill to the south-east.