What are the Skaftá cauldrons?

The Skaftá cauldrons are two large ice depressions (cauldrons) on the surface of Vatnajökull above the Skaftárjökull area. They form when geothermal heat melts ice from below; the resulting subglacial lakes periodically drain as jökulhlaups down the Skaftá river.

How often do Skaftá jökulhlaups occur?

Skaftá jökulhlaups occur roughly every 1–3 years, among the most frequent glacial outburst floods in Iceland. They can release millions of cubic meters of water in a matter of hours and flood the Skaftá river valley.

Can you visit Skaftárjökull?

Skaftárjökull is remote and not accessible for casual tourism. The glacier can be seen from a distance from certain highland vantage points, but the jökulhlaup risk in the Skaftá valley makes close approach dangerous during flood events.

Is the Skaftá river dangerous?

Yes, the Skaftá river can rise fast and without warning during jökulhlaup events. Water levels can increase tenfold within hours. Never camp near the river without checking flood warnings from IMO.

Is Skaftárjökull studied by scientists?

Yes, the Skaftá cauldrons and their jökulhlaup cycle are intensively studied by Icelandic and international glaciologists. The area provides valuable data on subglacial hydrology, geothermal activity, and flood dynamics.

Skaftárjökull and the Skaftá Cauldrons

A southwestern Vatnajökull outlet covering the Skaftá cauldrons, the source of Iceland's most frequent glacial outburst floods.

Last reviewed March 3, 2026By the Iceland.org travel deskEditorial policy

Region

Southwest Vatnajökull

Active jökulhlaup zone; check warnings.

Skaftárjökull covers one of the most geothermally active areas beneath Vatnajökull. The Skaftá cauldrons (two large ice depressions formed by geothermal heat) periodically fill with meltwater and drain catastrophically as jökulhlaups down the Skaftá river. These floods occur every 1–3 years, which makes the Skaftá one of the most frequently flooded glacial rivers in Iceland and a focus of scientific monitoring.

Sources and last reviewed

Last reviewed: 2026-03-03

The Skaftá river is subject to frequent jökulhlaups that can occur with little warning. Never camp near the river without checking IMO flood alerts. Follow all road closures immediately.

Pages are reviewed for practical usefulness, source quality, and volatile claims before publication.

Official sources to check

Best for

Glacial flood science

One of the world's most studied jökulhlaup sites.

Access

Remote / restricted

No direct access; view from distance only.

Pro tip

Monitor IMO alerts

Skaftá floods happen every 1–3 years.

What to Expect

Ice cauldron depressions visible on the glacier surface
Frequent flood activity in the Skaftá river below
A landscape shaped by repeated glacial outburst floods
Geothermal activity beneath the ice that creates subglacial lakes
One of the most scientifically monitored glacier sites in Iceland
Evidence of both volcanic and glacial forces in the terrain

Nearby Attractions

Skaftafell National Park with Svartifoss and glacier trails
Kirkjubæjarklaustur village and Systrafoss waterfall (south)
Lakagígar (Laki) craters, site of the 1783 eruption
Eldgjá volcanic fissure accessible via highland roads
Langisjór highland lake south of Vatnajökull
Skeiðarársandur outwash plain and bridge memorial

How to Get There

The Skaftá river valley is south of the glacier along Route 1
Highland roads provide distant views of the glacier area
4×4 required for any off-road approach
Check jökulhlaup warnings before traveling near the Skaftá river
The glacier itself is not accessible for casual visits

Best Time to Visit

Summer for best visibility and road conditions
Always check IMO for jökulhlaup warnings before visiting area
The Skaftá river area is best observed from safe distance
Combine with Lakagígar or Skaftafell for a full trip
Winter access to highland areas is not possible

Planning help

Skaftarjokull (Skaftárjökull) Glacier FAQs

Quick answers with safety notes where it matters.

All glaciers