The River Arun at the north of the civil parish of Nuthurst in West Sussex, England. The river here forms the boundary between Nuthurst and the town of Horsham, the outskirts of which reach to the bank opposite. The source of the Arun is approximately one mile to the east (right), where it is fed by tributary streams from St Leonard's Forest, part of the High Weald Area of Outstanding Natural Beauty, and Hammerpond Woods, in the civil parish of Colgate.