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Gunnuhver

Iceland's largest mud pool, on ground where the Atlantic ridge comes ashore, named for a ghost said to be trapped in it.

Updated 19 October 2026

Typegeothermal area
WhereReykjanes
Nearest cityGrindavik about 15 km; Keflavik about 20 km
Best seasonAll year
Time to allowAn hour
Getting thereRoad at the western tip of Reykjanes near the Reykjanesviti lighthouse
EntryFree

Gunnuhver lies at the far western tip of Reykjanes, where the Mid-Atlantic Ridge comes out of the sea onto land, and its heat comes from seawater rather than fresh - which makes the field unusually corrosive and the steam constant and dense. The main mud pool is about twenty metres across, the largest in Iceland. The name comes from a folk story: Gudrun, a woman who died in a dispute over rent and returned as a violent ghost, was reportedly lured into the spring by a priest and has been stuck there ever since. Boardwalks have been rebuilt more than once because the ground shifted and destroyed them, which is a fair description of the site's stability.

History

The geothermal areas of Reykjanes were described in the 18th century by Eggert Ólafsson, who surveyed Iceland's landscapes between 1752 and 1757. A folktale gives the spring its name: Guðrún Önundardóttir, Gunna, quarrelled with her landlord, Vilhjálmur Jónsson, over unpaid rent and the seizure of her cooking pot, and after her death she haunted the area until the pastor Eiríkur of Vogsósar lured her spirit to the hot spring with a ball of yarn (Wikipedia, Gunnuhver).

What you'll find

  • Iceland's largest mud pool - about twenty metres across, in constant steam.
  • Seawater-fed heat - the ridge coming ashore, making the field corrosive.
  • A ghost story attached - Gudrun, said to be trapped in the spring.
  • Rebuilt boardwalks - the ground has destroyed them before.

When to go

All year. An hour.

Practical notes

Steam frequently hides the pools entirely - it depends on wind. Sections of boardwalk close when the ground shifts. There are no facilities. It is exposed to wind straight off the Atlantic.

Nearby

Valahnukamol cliffs and the Reykjanesviti lighthouse are alongside; the Bridge Between Continents is close.

Key facts

Location63.8194° N, 22.6849° W · map

Source: Wikidata, item Q1554844, read on 18 October 2026.

What to pack for Gunnuhver

Chosen from what this place is for. Tap a kit for the full checklist.

  • Broken-in walking shoes or boots - Grip and ankle support matter more than looks; never hike in brand-new boots. Find on Amazon
  • Swimwear - Needed at most public thermal pools; some traditional baths are nude and single-sex. Find on Amazon
  • Layers + a waterproof shell - Mountain weather turns fast; a packable rain jacket saves the day. Find on Amazon
  • Quick-dry towel + flip-flops - For wet changing areas and hot poolside stone. Find on Amazon

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Plan your trip

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Opening times, ticket prices and seasonal closures change - check the official source before you go: official site.

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