Reykjadalur is a geothermal valley above Hveragerði where a 3.5-kilometer uphill trail leads to a naturally warm river. Plan for the walk itself and check for changing weather or trail closures before leaving.
Bathing details
Reykjadalur means ‘smoke valley’, a fitting name for a green valley broken by steam vents, hot springs and warm streams in the Hengill volcanic area.
The river draws most visitors, but the wider landscape gives Reykjadalur its character. The path climbs away from Hveragerði into open hills where geothermal activity appears beside the trail and warm water runs through the upper valley. The experience begins well before you reach the bathing area.
Unlike a commercial lagoon, Reykjadalur is an unstaffed natural site with no controlled water temperature or predictable bathing conditions. People come for the walk, the steam-filled valley and the chance to sit in a naturally heated river when current conditions allow it.
Local visitor information for the route, distance and current closure notice.
Regional overview of the geothermal valley and warm river.
Photo guide
The same geothermal activity that makes Reykjadalur special is why signs and marked paths need to decide where you go.
The local route description gives the walk as approximately 3.5 kilometers each way and about one hour uphill for an experienced hiker.
The time is a useful reference, not a promise. The path gains height, has uneven sections and is exposed to wind, rain and winter ice. A relaxed visit also needs time to stop in the valley and walk back down, so this is not a quick roadside soak. Less experienced walkers and families may take longer.
The route starts above Hveragerði, the geothermal town at the foot of the valley. Reykjadalur also lies within the wider Hengill area, which explains the hot ground, steam and frequent reminders to remain on the marked path.
The bathing area is a stretch of warm river rather than a built pool. Its temperature changes along the water, and the experience depends on nature rather than staff or machinery.
Boardwalks beside the river help protect the wet ground and provide places to reach the water. Bring a swimsuit, towel and dry layers, and expect to change outdoors with limited shelter. Stay on the marked route and do not approach other hot pools: some geothermal water in the valley is dangerously hot even when the river used by bathers feels comfortable.
If you prefer changing facilities and a managed visit, compare Reykjaböð near Hveragerði. It is a separate attraction, not the river bathing area; check its current admission and age rules.
Crowds can change the character of the stop, especially in settled summer weather. If the river is busy, the walk through the valley can still be worthwhile; decide on site whether bathing makes sense. Follow signs and any local restrictions you find on arrival.
Visit Hveragerði warns that the trail can be closed to protect both visitors and the path. A closure means choosing another place, not finding a way around the barrier.
Heavy rain, thaw, snow, ice or strong wind can make this exposed route slower or unsuitable. Check the local route page shortly before leaving, then use SafeTravel for alerts and the Icelandic Meteorological Office for the forecast and warnings. Conditions at the valley can differ from the streets below in Hveragerði.
Current safety alerts and travel conditions in Iceland.
Forecasts and warnings for deciding whether the exposed walk is sensible.
By ThorPublished Updated
