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Brennisteinsfjoll - Caving Tour

Volcanoes, lava fields and lava tubes - nature at its best

Brennisteinsfjoll is the synonym for extraordinary natural splendor just south of Reykjavik. This area is covered with hardened lava from 3 distinctive volcanoes nearby. Due to the geography of the area not many have researched it or traveled.


Duration: 12-16 hours

Available: On request

Included: Hotel pick up & drop off in Reykjavik, guided caving tour, flash light, gloves and helmet.

Bring with you: Warm clothes, sturdy shoes.

For further information: Contact Us

Upon request.

For groups only (not scheduled tour)

Contact us about availability...



Note: this tour has to be ordered in time, due to planning. This tour takes anywhere from 12-16 hours for hikers in good shape.


Tour Description

This is a unique and marvelous place and you are unlikely to see anything like this elsewhere else in the world. This is unique to this part of Iceland!

Extreme Iceland offers guided tours around the Brennisteinsfjoll area where we see everything from inactive volcanoes to lava tubes in those great lava fields.

Ferlir lava tube cave iceland

This cave is available in red

The tour takes includes between 12 and 16 hours of hiking and is only considered suitable for people in good shape and good health. This tour is at it’s best on a beautiful summer day in Iceland.

The tour starts in Reykjavik and from there we head to Herdisarvik in southern part of Reykjanes peninsula, just east of the town Grindavik. On the way to Herdisarvik, we make stops to check out some geothermal spouts.

From Herdisarvik we hike to Mosaskard where the lava flow from Eldborg in Brennisteinsfjöll Mountains flowed through the rift there. This is now called Hvammahraun lava field. From there we walk to the lava tube named Ferlir. Ferlir is well over 500 metres long and is a real labyrinth with magnificent lava formations, glassed walls and vivid colours due to sulfide minerals and oxidation.

Ferlir Lava tube and pillar

The nooks an corners are exciting places to explore

Next we head to Eldborg, an inactive volcano (570 m above sea level). From here we have an amazing view to the Vestmann islands and to Eyjafjallajokull glacier due east. The lava from Eldborg covers around 36 sq. kilometres and lot of this has flowed to the lower territories of the area.

Northeast of Eldborg lies the lava field of Kistuhraun which was created from a fissure in the volcano Kista around the year 1000 A.C. In this tour we’ll take a glance at the volcano Kista and some of the many lava tubes hidden in its hardened lava field.

Kistufellshraun lava field is the northernmost of the three lava fields in this area and it came from the crater Kistufell around 4000 years ago. The crater is about 400 metres in diameter and in ancient times 3 lava streams flowed from it in different directions. One of the passages is particularly magnificent due to the extreme scale of the forces of nature. The passage has several huge lava tubes, but in many places the ceilings have collapsed.

We’ll take a quick glance at 3 of the major tubes (Loftgeim, Jokulgeim and Iskjallarann) and if there’s time, we may take a look at other caves in the vicinity.

Lava fall and lava flow Ferlir cave Iceland

The molten rock has hardened like this

We’ll then walk due north over the lava expanse of Kistufell. When we approach Longuhlidar at the northern edge of the plateau, we will have a magnificent panoramic view to Reykjavik. From here the journey is all down hill, although trekking the cleft may be a difficult task for weary travelers.

Travelers are then greeted with refreshments and driven to Reykjavik.