Long Mountain (Welsh: Cefn Digoll) is a hill straddling the boundary between Powys (Wales) and Shropshire (England) to the east of Welshpool though the summit at 408 metres (1,339 feet) at Beacon Ring (grid reference SJ265058) is within Wales. Long Mountain is a Marilyn (a hill with topographic prominence of at least 150 metres), having a prominence of 305 metres (1,000 feet).