Herľany Geyser

Herľany geyser (Slovak: Herliansky gejzír) is a geyser located in the village of Herľany in Slovakia. The geyser is a natural phenomenon activated by human activity, but the eruption is influenced by nature, including recent rainfall. The Herľany Geyser is a rare cold geyser located at the foot of the Slanské vrchy Mountains, in the old spa area of the Herľany-Rankovce spa. It has been active continuously since 1872, and until 1903 and in the years 1957-2006 it was the only cold geyser in Europe. The geyser was declared a national natural monument in 1987, and since 2002 it has been on the tentative list of UNESCO World Heritage Sites. The geyser is a natural phenomenon activated by human activity by drilling a 404.5-meter-deep well. It sprays up to a height of 22 meters with a period of 34-36 hours, the eruption lasts approximately 25 minutes. The village's official website gives the time of the next expected eruption. According to a chemical analysis carried out in 1995, the water from the Herlany geyser is moderately mineralized, of the sodium-chloride-bicarbonate type. It is a natural bicarbonate-chloride, sodium, carbonic, sulfur hypotonic water. The average yield is 25-30 liters of water per second.

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