Coordinates: 64°39′47″N 21°24′33″W / 64.66306°N 21.40917°W / 64.66306; -21.40917
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Deildartunguhver (Icelandic pronunciation: [ˈteiltarˌtʰuŋkʏˌkʰvɛːr̥]) is a hot spring in Reykholtsdalur, Iceland. It is characterized by a very high flow rate for a hot spring (180 liters/second) and water emerges at 97 °C. It is the highest-flow hot spring in Europe.[1]

Some of the water is used for heating, being piped 34 kilometers to Borgarnes and 64 kilometers to Akranes.

Struthiopteris fallax (Lange) S. Molino, Gabriel y Galán & Wasowicz

A fern called Struthiopteris fallax,[2][3] grows in Deildartunguhver. This fern is the only endemic fern in Iceland, and it does not grow anywhere else in the world.


  1. ^ By comparison the combined flow of the 47 hot springs in Hot Springs, Arkansas is 35 liters/second and the water is 35 ° to 68 °. The Hay-Yo-Kay Hot Springs in Truth or Consequences, New Mexico has a flow of 99 liters/second. Lava Hot Springs in Idaho has a flow of 130 liters/second. Glenwood Springs in Colorado have a flow of 143 liters/second. The Dalhousie Springs complex in Australia had a peak total flow of more than 23,000 liters/second in 1915, giving the average spring in the complex an output of more than 325 liters/second. This has been reduced now to a peak total flow of 17,370 liters/second, so the average spring has a peak output of about 250 liters/second. However, there are many very-high-flow nonthermal springs; there are 33 recognized "magnitude one springs" (having a flow in excess of 2800 liters/second) in Florida alone. Silver Springs, Florida has a flow of more than 23,000 liters/second.
  2. ^ Molino, Sonia; Gabriel y Galán, Jose M.; Wasowicz, Pawel; de la Fuente, Pablo; Sessa, Emily B. (2019-02-16). "The Struthiopteris spicant (Blechnaceae, Polypodiopsida) complex in Western Europe, with proposals for taxonomic and nomenclatural changes". Plant Systematics and Evolution. 305 (4): 255–268. doi:10.1007/s00606-019-1565-0. ISSN 2199-6881.
  3. ^ Perez, Ruben Pino; Galan, Jose Maria Gabriel Y.; Wasowicz, Pawel (2017-03-31). "New combinations in Struthiopteris spicant for the European flora". Phytotaxa. 302 (2): 198–200. doi:10.11646/phytotaxa.302.2.11. ISSN 1179-3163.

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64°39′47″N 21°24′33″W / 64.66306°N 21.40917°W / 64.66306; -21.40917