Lancing is a large coastal village and civil parish in the Adur district of West Sussex, England, on the western edge of the Adur Valley. It occupies part of the narrow central section of the Sussex coastal plain between smaller Sompting to the west, larger Shoreham-by-Sea to the east, and the parish of Coombes to the north. Excluding definitive suburbs it may have the largest undivided village cluster in Britain. However, its economy is commonly analysed as integral to the Brighton/Worthing/Littlehampton conurbation. Its settled area beneath the South Downs National Park covers 3.65 square miles (9.5 square kilometres; 2,340 acres), the majority of its land.