Minerální pramen Tereza, Mineral spring in Lázně Kynžvart, Czech Republic.

Minerální pramen Tereza is a mineral spring in Lázně Kynžvart, Cheb District, emerging at the site of a former peat bog on the edge of a small wood by the Valy–Lázně Kynžvart road. Its water is captured in a brick shaft, and since 2011–2012 the overflow has run through a large carved tree trunk decorated with a carving of a girl, placed outside the shaft.

Listed as the ninth spring on the Kynžvart estate by Professor Steinmann in 1818, it was called "Devátá" (ninth). The Metternich estate administration captured it in a brick tank and piped the water to the Richard bottling plant near the station, where it was briefly bottled before World War I. Buried by slope sediments after the 1950s, it was cleaned in 2011–2012 and renamed Tereza on 26 April 2014.

The spring's name comes from Tereza, granddaughter of the local farmer who made the spring on his land accessible; it was renamed during a blessing ceremony on 26 April 2014. Since then people from the wider area have come for its mildly sparkling water, which is close in mineral content to the nearby Richard spring.

The spring sits by the Valy–Lázně Kynžvart road at the edge of a small wood, reached by a newly built field path. The overflow was placed outside the brick shaft into a large carved tree trunk, so look for the trunk rather than a spa building. Volunteers cleaned the outlet in 2011–2012; the water is drawn from the trunk.

The spring's old name "Devátá" (ninth) comes from Professor Steinmann's 1818 list of mineral springs on the Kynžvart estate, where it appeared ninth; the German form was "neun". The overflow was placed outside the brick shaft in a large carved tree trunk showing a girl, and the spring was renamed Tereza in 2014 after the granddaughter of the local farmer who made it accessible.