Reykjanes is riddled by a subterranean network of lava tubes, formed when the sides of a deep lava flow cool and solidify, allowing the still-liquid centre to drain away after the eruption ends. Pick of the local tubes include kilometre-long Raufarholshellir; the similarly scaled Buri Cave, only discovered in 2005; Þríhnúkagígur, though this is actually a drained magma chamber; and Leiðarendi, perhaps the most accessible. With the exception of Þríhnjúkagígur, you can only visit these as part of a tour offered by extremeiceland.is (9500–25,000kr/person).

Travel offers; book through Rough Guides

Iceland features

The latest articles, galleries, quizzes and videos.

The best places to visit in Iceland in summer

The best places to visit in Iceland in summer

Iceland is famous for majestic glaciers and snow-covered houses, for the Northern Lights and blue-lit ice caves. Visit in summer, though, and it can feel like …

16 Feb 2017 • Rebecca Hallett insert_drive_file Article
Hot tub happiness: the dos and don'ts of Icelandic spas

Hot tub happiness: the dos and don'ts of Icelandic spas

Going for a spa in Iceland can feel wonderfully alien. Against a backdrop of barren moonscapes and denuded hills, the waters are so preternaturally blue, so exa…

24 Nov 2016 • Mike MacEacheran insert_drive_file Article
A day-by-day itinerary for the perfect weekend in Reykjavík

A day-by-day itinerary for the perfect weekend in Reykjavík

Reykjavík, a bustling port and the world’s most northerly capital, draws visitors from across the globe in record-breaking numbers – and its popularity sho…

12 May 2016 • Rough Guides Editors insert_drive_file Article
View more featureschevron_right

Join over 60,000 subscribers and get travel tips, competitions and more every month

Join over 60,000 subscribers and get travel tips, competitions and more every month