from the website–
Raufarhólshellir, one of the longest and best-known lava tubes in Iceland.
One walks in the path of lava that flowed during the Leitahraun eruption, which occurred east of the Bláfjöll mountains about 5200 years ago.
The total length of the tunnel is an impressive 1360 m (4500 ft), the main tunnel being 900 m (3000 ft) long. The tunnel is up to 30 m wide with headroom up to 10 m high, making it one of the most expansive lava tunnels in Iceland. Near the entrance of the tunnel the ceiling has caved in creating three beautiful columns of light inside the tunnel. At the end of Raufarhólshellir the tunnel branches into three smaller tunnels where magnificent lava falls and formations are clearly visible.
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When we reached the end of the tunnel the guide had us turn our headlamps off. Then she told us not to make a sound as she turned the lights in the tunnel off. Complete darkness. Nothing but the sound of the water dripping down through the porous rock.
Very cool.
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