Shoreham-by-Sea (often shortened to Shoreham) is a coastal town and port in West Sussex, England. The town is bordered to its north by the South Downs, to its west by the Adur Valley, and to its south by the River Adur and Shoreham Beach on the English Channel. The town lies in the middle of the ribbon of urban development along the English south coast, approximately equidistant from the city of Brighton and Hove to the east and the town of Worthing to the west.  Shoreham Beach, to the south of the town, is a shingle spit deposited over millennia by longshore drift. This blocks the southerly flow of the River Adur which turns east at this point to discharge into the English Channel further along the coast at a point that has varied considerably over time. The seaside shingle bank of Shoreham beach extends further east past the harbour mouth, forming the southern boundary of the commercial harbour in Southwick, Portslade, and Hove.