Buxton is a spa town in the Borough of High Peak in Derbyshire, England. It is England's highest market town at some 1,000 feet. It lies close to Cheshire to the west and Staffordshire to the south on the edge of the Peak District National Park. The municipal borough merged in 1974 with places that included Glossop to form the local government district and borough of High Peak. The town population was 22,115 at the 2011 Census. Sights include Poole's Cavern, a limestone cavern, St Ann's Well, fed by a geothermal spring bottled by Buxton Mineral Water Company, and Georgian buildings round John Carr's restored Buxton Crescent, including Buxton Baths. Also notable is Frank Matcham's Buxton Opera House. The Devonshire Campus of the University of Derby occupies historic premises. Buxton is twinned with Oignies, France, and Bad Nauheim, Germany.