The River Arun (/ˈærən/) is a river in the English county of West Sussex. At 37 miles (60 km) long, it is the longest river entirely in Sussex and one of the longest starting in Sussex after the River Medway, River Wey and River Mole. From the series of small streams that form its source in the area of St Leonard's Forest in the Weald, the Arun flows westwards through Horsham to Nowhurst where it is joined by the North River. Turning to the south, it is joined by its main tributary, the western River Rother, and continues through a gap in the South Downs to Arundel to join the English Channel at Littlehampton. It is one of the faster flowing rivers in England, and is tidal as far inland as Pallingham Quay, 25.5 miles (41.0 km) upstream from the sea at Littlehampton. The Arun gives its name to the Arun local government district of West Sussex.
The first major improvements to the river were made between the 1540s and the 1570s, when Arundel became a port, and navigation up to Pallingham was improved, but barges had difficulty negotiating the flash locks that were installed. The work was carried out by Henry FitzAlan, 19th Earl of Arundel, who made the upper section toll-free. Harbour commissioners managed the lower river from Arundel to the sea from 1732, and major improvements to keep the estuary free from silt were sanctioned by an act of Parliament obtained in 1793. With the coming of the railways and changes in coastal shipping, Littlehampton superseded Arundel as the port of the Arun, and the Littlehampton harbour commissioners are still responsible for the river up to Arundel, collecting tolls for its use.
