Hike
3 km each way
Well-marked trail from Hveragerði parking
Reykjadalur Hot River: Hike to a Geothermal River in South Iceland
A geothermally heated river in a steaming valley near Hveragerði, a 3 km hike from the trailhead.
Location
Hveragerði
South Iceland • Free admission
Reykjadalur, meaning "Steam Valley," is a free natural bathing spot just outside Hveragerði, a 45-minute drive from Reykjavík. The trail winds through a geothermal landscape of bubbling mud pots, steaming vents, and green hillsides before reaching the warm river. Wooden boardwalks along the riverbank let you pick a temperature: cooler downstream, hotter upstream.
Sources and last reviewed
Last reviewed: 2026-03-03
Stay on marked trails in geothermal areas. The river is free to access but there are no lifeguards or facilities.
Pages are reviewed for practical usefulness, source quality, and volatile claims before publication.
Official sources to check
Temperature
Varies 20–50°C
Cooler downstream, hotter upstream
Cost
Free
No admission fee or booking required
What to Expect
River Bathing (20-50°C)
Soak in a naturally heated river where temperatures range from 20°C downstream to over 50°C near the geothermal source upstream. Comfortable bathing spots sit around 38-40°C
3 km Valley Hike
Well-marked trail with 150 m elevation gain passes bubbling mud pots, hissing steam vents, and a small waterfall. Takes 45-60 minutes each way
Free Admission
No entrance fee or booking required. The river itself costs nothing to use
What to Bring
Swimsuit (wear under clothes), towel, sturdy hiking shoes, water bottle, and snacks. Water shoes helpful for the rocky riverbed. No facilities at the river
Wooden Privacy Screens
Small wooden privacy screens along the riverbank serve as basic changing areas. No permanent changing rooms, toilets, or showers at the bathing spot
45 Minutes From Reykjavík
One of the closest natural hot springs to the capital. An easy half-day trip from Reykjavík, with time left for a stop in Hveragerði town
Getting There
From Reykjavík, drive 45 km south on Route 1 to Hveragerði (about 45 minutes). In Hveragerði, follow signs to the Reykjadalur trailhead; the parking lot is at the end of a short road on the upper edge of town. The parking area has restroom facilities and an information board. It can fill up quickly on summer weekends, so arrive before 10 AM. The 3 km trail takes 45-60 minutes each way with 150 m elevation gain on a well-marked path. No 4WD required to reach the parking area. The nearest services (cafes, shops, fuel) are in Hveragerði town center (5 minutes by car).
Best Time to Visit
June through August: ideal conditions with dry trails, long daylight (up to 21 hours), and warmest air temperatures. This is also peak crowd season, so arrive before 9 AM or after 5 PM for fewer people. September through October: autumn colors in the valley, thinner crowds, and cooler air that makes the warm water feel even better. November through March: winter hiking is possible but requires microspikes or crampons, warm waterproof layers, and a headlamp. In return you get steam rising against cold air and a chance of northern lights while you soak. April through May: trails drying out with returning daylight and moderate crowds. Weekday mornings are quietest in every season.
Planning help
Reykjadalur FAQs
Quick answers with safety notes where it matters.