Mariánské Lázně is a spa town in Cheb District in the Karlovy Vary Region of the Czech Republic. The top attraction of the town is its 100 mineral springs (53 of them are tapped) with high carbon dioxide content and often also higher iron content, both in the town itself (40 springs) and its surroundings. The water in the springs has an average temperature of 7-10 °C, and is formed through interactions with the deep fault lines that run under the region.