Westbourne is a village ,
civil parish and
electoral ward in the
Chichester District of
West Sussex, England. It is located north east of
Emsworth. The parish includes the hamlets of Woodmancote and Aldsworth, and once included the settlements of
Southbourne and Prinsted to the south. The village stands on the
River Ems, a small river flowing into
Chichester Harbour at
Emsworth. It is believed that the village takes its name from its position on the river, which traditionally marks the westernmost boundary of
Sussex, bourne being an archaic term for a boundary as well as for a small river or brook.