Reykjadalur Hot River

Overview

Reykjadalur Hot River is Iceland's most accessible geothermal bathing river, offering visitors the rare opportunity to soak in naturally heated waters flowing through a pristine valley. Located in the geothermally active Hengill area, this remarkable natural phenomenon combines boiling hot springs with a cool mountain stream, creating sections of perfectly temperate water ideal for bathing. The river sits within Reykjadalur valley (literally "Steam Valley"), where dozens of hot springs and fumaroles create an otherworldly landscape of rising steam clouds and mineral-stained earth.

What sets Reykjadalur apart from Iceland's numerous hot springs is its unique river format and accessibility. Unlike enclosed pools or lagoons, this flowing geothermal system allows visitors to find their preferred water temperature by moving upstream or downstream within the bathing area. The combination of dramatic geothermal activity, stunning mountain scenery, and the novelty of river bathing makes it one of Iceland's most distinctive natural attractions.

The site has gained significant popularity among both tourists and locals, particularly as a year-round bathing destination that showcases Iceland's geothermal heritage in its most natural form. The approach hike through Reykjadalur valley provides an excellent introduction to Icelandic highland scenery, complete with wooden boardwalks traversing active geothermal fields.

Quick Facts

**GPS Coordinates:** 64.0463°N, 21.2200°W

**Entry Fee:** Free

**Opening Hours:** 24/7 (daylight recommended)

**Best Time to Visit:** June to September for optimal conditions

**Difficulty Level:** Moderate (3km hike each way)

**Elevation Gain:** 200 metres

**Nearest Town:** Hveragerði (3km)

**Distance from Reykjavík:** 45km

**Water Temperature:** 36-40°C in bathing areas

**Hiking Time:** 45-60 minutes each way

How to Get There

Driving

From Reykjavík, take Route 1 (Ring Road) eastbound for 37km to Hveragerði. The journey takes approximately 35 minutes in normal conditions. At Hveragerði's main roundabout, follow signs for "Reykjadalur" and turn north onto Reykjadalsvegur road. Continue for 3km on this paved road, which becomes increasingly narrow and winds uphill through residential areas before reaching the designated car park.

Alternative approach via Route 38: Take Route 38 from Reykjavík through Þingvellir, then Route 35 south to connect with Route 1 near Selfoss, adding approximately 20 minutes but offering scenic variety.

Parking

The official Reykjadalur car park accommodates roughly 100 vehicles in a gravel lot beside a small information shelter. Parking is free but spaces fill quickly during peak summer months, particularly between 10:00-15:00. Overflow parking along the road is discouraged due to local traffic concerns. The car park includes basic facilities: information boards, waste bins, and a composting toilet.

Access

The trailhead begins directly from the car park, marked by clear signage and a wooden boardwalk. The 3km trail follows a well-maintained path with wooden boardwalks across geothermal areas, gravel sections, and stone steps. The route is suitable for regular hiking footwear, though waterproof boots are recommended during wet conditions. Allow 45-60 minutes walking time each way, plus bathing time.

What to See and Do

The primary attraction is the geothermal river itself, where bathers can soak in naturally heated water while surrounded by dramatic valley scenery. The main bathing area spans approximately 100 metres of river, with water temperatures ranging from 36-40°C. Small pools and eddies along the riverbank provide calmer bathing spots, while the flowing sections offer a unique current-massage experience.

The approach hike showcases diverse geothermal phenomena: bubbling mud pots, steaming fumaroles, and mineral deposits creating vibrant orange and yellow ground coloration. Wooden boardwalks protect both visitors and fragile geothermal features whilst providing excellent photography opportunities. The valley's geothermal field contains over 40 individual hot springs, many reaching temperatures above 80°C.

Wildlife viewing opportunities include common ravens, wheatears, and occasional arctic foxes. The surrounding hillsides support typical Icelandic highland vegetation: moss, sedges, and hardy wildflowers during summer months. The upper valley provides excellent views across the Hengill geothermal area and towards distant mountains.

Photography enthusiasts will find exceptional subjects year-round: dramatic steam contrasts, mineral formations, and seasonal lighting effects. Winter visits offer particularly striking imagery with snow-covered landscapes and enhanced steam visibility.

Best Time to Visit

**June-August:** Peak season with warmest air temperatures, longest daylight hours, and most comfortable hiking conditions. Expect crowds, especially weekends. Trail conditions are excellent, but parking fills early.

**April-May, September-October:** Shoulder seasons offering fewer crowds and pleasant bathing experiences. Weather can be variable, with occasional rain making trails muddy. Daylight hours remain adequate for safe hiking.

**November-March:** Winter bathing provides unique experiences with snow-covered surroundings and dramatic temperature contrasts. Shorter daylight hours require early starts. Trail conditions vary significantly with weather; crampons may be necessary during icy periods. Car park access can be challenging during heavy snow.

**Year-round considerations:** The geothermal river maintains consistent temperatures regardless of season. Weather changes rapidly; always check forecasts before departure.

Safety

Water temperatures vary significantly throughout the river system. Test carefully before entering, as some areas exceed safe bathing temperatures (45°C+). The riverbed contains loose stones and can be slippery; enter slowly and maintain footing.

Weather exposure is significant during the open hike across the valley. Sudden weather changes are common; pack waterproof clothing and warm layers regardless of conditions at departure. High winds can make the exposed sections uncomfortable and potentially dangerous during storms.

Geothermal areas contain fragile, potentially dangerous features. Stay on marked paths and boardwalks. Thin ground crusts around hot springs can break through, causing serious burns. Never venture off designated routes in geothermal fields.

Winter hiking requires additional preparation: proper footwear with grip, headtorch for limited daylight hours, and emergency shelter. River ice can form during extreme cold, but geothermal flow usually maintains open water in bathing areas.

Mobile phone coverage is intermittent in the valley. Inform others of planned return time and carry emergency supplies for extended delays.

Nearby Places

**Hveragerði Geothermal Park** (3km): Town centre geothermal area featuring hot springs, greenhouses, and the Earthquake Exhibition. Easy walking access with family-friendly facilities.

**Kerið Crater Lake** (25km): Distinctive volcanic crater containing a turquoise lake, located along the Golden Circle route. 10-minute walk from roadside parking.

**Þingvellir National Park** (55km): UNESCO World Heritage site showcasing the Mid-Atlantic Ridge rift valley and Iceland's historic parliament site. Multiple hiking trails and geological features.

**Geysir Geothermal Area** (65km): Home to Strokkur geyser and extensive geothermal features. Part of the classic Golden Circle route with visitor facilities and guided tours.

**Seljavallalaug Pool** (85km): Historic outdoor geothermal pool requiring a 1.5km hike, offering a more remote bathing experience beneath dramatic mountain scenery.

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