The river follows an "S"-shaped course, the northern loop encircling the village of North Stoke and the south one encircling South Stoke. Immediately to the south, the old course passes under the railway line, but a new channel was cut to the west of the railway. On the west bank is the hamlet of Offham and Arundel Wetland Centre, a haven for birds which is run by the Wildfowl & Wetlands Trust. The market town of Arundel is to the west of the river. It has a castle build on a motte, the construction of which was started in 1068. It is owned by the Duke and Duchess of Norfolk. The present building consists of many different components, dating from the late eleventh century through to the nineteenth, and is Grade I listed. Two bridges span the river here, the first on the original road through the town, while the second carries the A284 Arundel Bypass. The final section is crossed by a railway bridge, built in 1908, and the A259 road bridge, which carries the road into Littlehampton on the east bank. It discharges into the English Channel between the East and West Piers.