Reykjadalur

Tucked into the hills above the geothermal town of Hveragerði, Reykjadalur ("Steam Valley") is one of Iceland's most rewarding natural experiences: a hike-in geothermal valley where a naturally heated river flows warm enough to bathe in, completely free, against a backdrop of steaming vents and mossy lava fields.

Why Reykjadalur Is So Special

The valley sits within the Hengill volcanic system, where the North American and Eurasian tectonic plates pull apart. Groundwater seeps deep into fractured volcanic rock, heats to extreme temperatures, then rises back to the surface as hot springs. By the time the superheated water mingles with cold mountain streams at the bathing area, the river temperature settles into a comfortable soaking range — warmer the further upstream you venture. It is a rare place where raw geological forces translate directly into a serene, accessible experience for any visitor.

What to Expect on the Trail

The out-and-back trail from the Hveragerði trailhead is around 3 km each way, with the steepest climbing in the first section. Along the way you pass:

• Steaming fumaroles and bubbling mud pools beside the path
• The "Queen's Borehole" (Drottningarhola), a striking geothermal feature near the start
• Sweeping views back over the Ölfusá river plain toward the coast

Wooden boardwalks and changing screens at the main bathing area make it easy to get in and out of the water. The round trip takes most walkers two to three hours, more with lingering.

Practical Tips

• Wear layers and waterproof boots — the lower trail can be muddy, and Icelandic weather changes quickly.
• Bring a towel and a dry bag for your clothes while you soak.
• Arrive early or on a weekday to avoid the busiest crowds; the valley is popular year-round but especially so in summer.
• The hike and bathing are free of charge; paid parking is available at the trailhead.
• The valley is open in all seasons, though the trail can be icy and the approach road restricted in winter.

Pairing Reykjadalur with a Golden Circle Day Trip

Hveragerði sits right on the edge of the Golden Circle corridor, roughly 45 minutes southeast of Reykjavík. It makes a natural bookend to a Golden Circle loop — start early with Þingvellir, Geysir, and Gullfoss, then wind down the day with a hot-river soak on the drive back to the city. Many guests find this combination the perfect blend of cultural landmarks and pure, restorative nature.