north-iceland · Iceland
Grjótagjá Cave
About Grjótagjá Cave
Descend into Grjótagjá, a mesmerizing rift cave where the North American and Eurasian tectonic plates diverge. Inside, an ethereal electric-blue geothermal pool shimmers, its warm mist reflecting off the dark, textured rock walls, creating a truly otherworldly atmosphere. Though too hot for bathing, this stunning natural wonder offers an unforgettable visual experience.
History & Background
This site in North Iceland has captivated visitors and locals alike throughout Iceland's history. The natural formations here were shaped over thousands of years by the forces of volcanism, glaciation, and erosion, specifically the ongoing separation of the North American and Eurasian tectonic plates. Early settlers recognized the unique beauty of this place, and it features in various historical accounts and folklore, likely used for its naturally warm waters. For decades, Grjótagjá served as a beloved local bathing spot, a hidden geothermal oasis providing warmth and therapeutic benefits. However, its fate changed dramatically with the Krafla eruptions between 1975 and 1984. These powerful geological events significantly increased the water temperature within the cave, rendering it dangerously hot and unsuitable for bathing, with temperatures consistently exceeding 50°C. This led to the prohibition of swimming to ensure public safety and protect the delicate natural environment. Despite the bathing ban, Grjótagjá's allure only grew. Its unique geological setting and ethereal beauty caught the eye of filmmakers, leading to its memorable appearance in Season 3 of HBO's Game of Thrones. Today, Grjótagjá stands as a testament to Iceland's dynamic geology and its blend of natural wonder and cultural significance, continuing to draw visitors from around the world who come to witness its extraordinary landscape and vibrant blue pool.
Did You Know?
- ✔Lava cave with hot spring
- ✔Electric-blue pool
- ✔Game of Thrones filming spot
- ✔Too hot for bathing (50°C+)
- ✔5 min from Route 1
Tours Near Grjótagjá Cave
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No specific tours found for this attraction.
Browse Iceland Tours →About Grjótagjá Cave
Grjótagjá, located near Mývatn in North Iceland, is a captivating rift cave that offers a unique glimpse into the island's geological heart. Formed where the North American and Eurasian tectonic plates pull apart, this small lava cave houses a truly stunning natural geothermal pool. The water, a vibrant, electric blue, emits a gentle mist that dances in the cave's dim light, reflecting beautifully on the dark, rugged rock walls, as seen in the provided image. While the pool's temperature, consistently around 50°C (122°F) or higher, makes bathing unsafe and prohibited, the visual spectacle alone is worth the visit. For decades, locals enjoyed the therapeutic waters here, but the Krafla eruptions from 1975-1984 dramatically increased the water's heat, ending the tradition. However, this geological activity has left behind a breathtaking natural wonder. Grjótagjá gained international fame as a filming location for Season 3 of HBO's Game of Thrones, serving as the romantic hideaway for Jon Snow and Ygritte. Access to Grjótagjá is straightforward via a gravel road from Route 1 near Mývatn, followed by a short 5-minute walk from the parking area. Entry is free, and a ladder or stairs lead down into the cave. It's open year-round, offering different atmospheric experiences depending on the season. Inside, the cave floor can be uneven, and the ceiling is low in places, so watch your head. Despite its small size, the cave can become crowded, especially during peak season, so consider visiting early or late in the day. Remember, the primary rule is absolutely no bathing to ensure both your safety and the preservation of this fragile environment. Combine your visit with nearby attractions like Mývatn Nature Baths, Hverir geothermal area, and the Dimmuborgir lava formations for a full day of North Icelandic exploration.
History & Background
This site in North Iceland has captivated visitors and locals alike throughout Iceland's history. The natural formations here were shaped over thousands of years by the forces of volcanism, glaciation, and erosion, specifically the ongoing separation of the North American and Eurasian tectonic plates. Early settlers recognized the unique beauty of this place, and it features in various historical accounts and folklore, likely used for its naturally warm waters. For decades, Grjótagjá served as a beloved local bathing spot, a hidden geothermal oasis providing warmth and therapeutic benefits. However, its fate changed dramatically with the Krafla eruptions between 1975 and 1984. These powerful geological events significantly increased the water temperature within the cave, rendering it dangerously hot and unsuitable for bathing, with temperatures consistently exceeding 50°C. This led to the prohibition of swimming to ensure public safety and protect the delicate natural environment. Despite the bathing ban, Grjótagjá's allure only grew. Its unique geological setting and ethereal beauty caught the eye of filmmakers, leading to its memorable appearance in Season 3 of HBO's Game of Thrones. Today, Grjótagjá stands as a testament to Iceland's dynamic geology and its blend of natural wonder and cultural significance, continuing to draw visitors from around the world who come to witness its extraordinary landscape and vibrant blue pool.
Why Visit
Walk into a lava rift cave with an electric-blue geothermal pool — a Game of Thrones filming location.
Did You Know?
Grjótagjá cave is literally nestled within the Mid-Atlantic Rift, marking the exact spot where North American and Eurasian tectonic plates slowly pull apart.
The Lagarfljót Wyrm
The lakes and rivers of North and East Iceland are said to harbor the Lagarfljótsormurinn, a fearsome serpent similar to Scotland's Loch Ness Monster. According to legend, a young girl placed a gold ring on a heath serpent to make it grow, but the creature grew so large and fierce that she threw it into Lagarfljót lake. The serpent continued to grow and has terrorized the area for centuries. Sightings have been reported well into the modern era, with some photographs and videos purporting to show the creature. Whether real or imagined, the legend reflects Iceland's deep connection to its watery landscapes and the mysteries they hold.
📖 Stories & Legends
Icelandic sagas and folklore from this area
Hidden Gems Nearby
Off-Peak Visit
Visit this attraction during shoulder season (May or September) for a perfect balance of access and solitude.
You'll experience the site without summer crowds while still having good weather and daylight.
Local Flora
Look for the native Icelandic plants growing in the area — Arctic thyme, moss campion, and various lichens.
These resilient plants have adapted to survive harsh conditions and add subtle beauty to the landscape.
Changing Light
this attraction looks dramatically different depending on the time of day and weather conditions.
Cloud shadows, rain showers, and low-angle sunlight can transform the landscape within minutes — Iceland's famous "four seasons in one day."
Practical Information
Best Time
Morning or late afternoon to avoid crowds, May-September for best weather.
Duration
15-20 minutes
Access
Gravel road from Route 1 near Mývatn, 5-minute walk from parking. Ladder/stairs into cave. Free.
Frequently Asked Questions
Is Grjótagjá cave safe to swim in?▾
No, bathing in Grjótagjá is strictly prohibited and dangerous due to the extremely high water temperature, which typically exceeds 50°C (122°F).
Is there an entrance fee for Grjótagjá?▾
No, entry to Grjótagjá cave is free of charge.
How long should I plan for a visit to Grjótagjá?▾
A visit to Grjótagjá typically takes about 15-20 minutes, allowing enough time to descend into the cave, admire the pool, and take photos.
What should I be aware of when visiting the cave?▾
The cave floor is uneven, and the ceiling is low in some areas, so watch your step and your head. It can also get crowded, and bathing is strictly forbidden.
Is Grjótagjá accessible year-round?▾
Yes, Grjótagjá is generally accessible year-round, although conditions on the gravel road leading to it might vary in winter.
