Buxton is a spa town in Derbyshire, England. It has the highest elevation—about 300m above sea level—of any market town in England. Close to the county boundary with Cheshire to the west and Staffordshire to the south, Buxton is described as "the gateway to the Peak District National Park". A municipal borough until 1974, Buxton was then merged with other localities lying primarily to the north, including Glossop, to form the local government district and borough of High Peak within the county of Derbyshire. Economically, Buxton is within the sphere of influence of Greater Manchester. The population of the town was 22,115 at the 2011 Census.Buxton is home to Poole's Cavern, an extensive limestone cavern open to the public, and St Ann's Well, fed by the geothermal spring bottled and sold internationally by Buxton Mineral Water Company. Also in the town is the Buxton Opera House, which hosts several music and theatre festivals each year. The Devonshire Campus of the University of Derby is housed in one of the town's historic buildings.Buxton is twinned with two towns: Oignies in France and Bad Nauheim in Germany.