north-iceland · Iceland
Hverfjall Tephra Ring
About Hverfjall Tephra Ring
Hverfjall (also spelled Hverfell) is one of the most recognizable landmarks in the Mývatn area — a massive, nearly perfect circle of a tephra crater rising 140 meters above the surrounding landscape. The crater is about 1 km in diameter and was formed by a volcanic explosion approximately 2,500 years ago. A trail leads to the rim, where visitors can walk around the entire circumference with sweeping views of Lake Mývatn, Dimmuborgir, and the Krafla volcanic system.
History & Background
Hverfjall Crater has been a significant site in Iceland's landscape. Throughout the years, this location has played an important role in Icelandic culture and natural history.
Did You Know?
- ✔Nearly perfectly circular tephra/tuff ring crater, 1 km in diameter
- ✔About 2,500 years old, formed in a massive explosive eruption
- ✔140 meters high with a 1 km circumference rim trail
- ✔Panoramic views of Mývatn, Krafla, and surrounding volcanic terrain
Tours Near Hverfjall Tephra Ring
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No specific tours found for this attraction.
Browse Iceland Tours →History & Background
Hverfjall Crater has been a significant site in Iceland's landscape. Throughout the years, this location has played an important role in Icelandic culture and natural history.
Story & Folklore
Hverfjall is one of the most dramatic and perfectly formed volcanic features in Iceland — a tephra ring crater 1 kilometre in diameter and 140 metres deep, formed in a single violent phreatomagmatic explosion about 2,500 years ago when magma encountered groundwater. The crater is dark grey and eerily uniform: the tephra (fragmented volcanic rock) has not yet had time to develop the thick vegetation cover that softens older Icelandic volcanic features. A 45-minute circular trail around the rim rewards with spectacular 360° views encompassing Lake Mývatn, Dimmuborgir, Krafla, Hverir and the entire volcanic landscape of North Iceland. Hiking down into the crater itself is prohibited to protect the fragile tephra surface.
Visitor Information
Best Time
May–October for best trail conditions
Duration
1–1.5 hours
Access
Off Route 848 near Dimmuborgir, east side of Mývatn. Two trailheads — south side is steeper but shorter.
Why Visit
Walk the 1km rim for panoramic views of North Iceland
Did You Know?
Formed in a massive explosion about 2,500 years ago
The Troll of Hverfjall Crater
An ancient tale speaks of a troll who once roamed Hverfjall Crater. The troll was caught by the rising sun while traveling home and turned to stone, becoming part of the landscape. Local people say you can still see the troll's silhouette in the mountain formation, forever frozen as a reminder to respect the power of daylight.
📖 Stories & Legends
Icelandic sagas and folklore from this area
Hidden Gems Nearby
Lava Formations Close-Up
Look carefully at the lava formations near Hverfjall Crater — each tells a story of how it cooled.
Rope lava, pillow lava, and columnar basalt each formed under different conditions, creating a geological textbook in stone.
Moss & Lichens
The moss and lichen growing on the volcanic rock are some of the first life to colonize new lava fields.
Some of these organisms grow less than 1cm per year, meaning the patches you see may be decades or centuries old.
Sunset Colors
The volcanic rock takes on incredible red and gold hues during sunset.
The iron-rich minerals in the lava glow in warm light, creating a photographer's paradise.
Practical Information
Best Time
May–October for best trail conditions
Duration
1–1.5 hours
Access
Off Route 848 near Dimmuborgir, east side of Mývatn. Two trailheads — south side is steeper but shorter.
Frequently Asked Questions
Is it safe to visit volcanic sites in Iceland?▾
Most volcanic sites are safe when you stay on marked trails. Always check SafeTravel.is for current volcanic activity alerts.
Do I need a guide to visit this site?▾
Many volcanic sites can be visited independently, but guided tours offer valuable geological insight and enhanced safety.
Can I visit in winter?▾
Access depends on the specific site and road conditions. Check road.is for current conditions before your visit.
