Lava tubes

natural conduits through which lava travels beneath the surface of a lava flow

world nature heritage site in South Korea

lava tube and tourist attraction in Haria, Lanzarote, Canary Islands, Spain

right|thumb|One of four entrances to the Surtshellir lava tube in the Hallmundarhraun lava field. right|thumb|Looking up towards the fourth (lowest and farthest west) entrance to Surtshellir, seen from within the section of the cave called Íshellir (ice-cave). The white slab is ice, which was preserved into summertime. thumb|Typical passage shapes in the Surtshellir-Stefanshellir lava tube system, showing intact walls and pahoehoe floors Surtshellir () is a lava cave located in western Iceland, around 60 km from the settlement of Borgarnes. Approximately a mile in length, it is one of the

national monument in the United States

shield volcano in Kenya

national monument in the United States

Cave in Icod de los Vinos, Northern Tenerife

mountain in United States of America

protected area in Portugal

Manjanggul () is a lava tube located in Gimnyeong-ri, Gujwaeup, Jeju City, South Korea. At up to wide, high and 8.928 km (5½ miles) long, it is the 12th-longest lava tube in the world and the second longest on Jeju Island. It is the only cave of the Geomunoreum Lava Tube System, considered one of the finest lava tube systems in the world. It is regularly open to the public, although a significant portion of the cave is closed to visitors. It is also part of the UNESCO World Heritage Site list, under the item Jeju Volcanic Island and Lava Tubes.

national monument in the United States

volcanic field in the Hejaz, Saudi Arabia

thumb|right|Víðgelmir in Iceland - Expeditioners are walking on top of a "pipe" formed when half molten lava "skin" rolled down the walls when the eruption receded. thumb|right|Víðgelmir has many ice-formations deep within the cave. Víðgelmir () is a lava tube situated in the Hallmundarhraun lava field (formed around 900 AD) in west Iceland, around 2 km southeast of Fljótstunga farm in Hvítársíða, Borgarfjörður. The roof of the lava tube has collapsed, creating two large openings near its north end which are the only known entrances. Víðgelmir is 1585 m long and the largest part of t

architectural structure

sub-surface tunnel on the Moon, believed to have formed during basaltic lava flows

national park in Australia

protected area in Portugal

cave

cave in Japan

lava tube in Japan

thumb|Area near the entrance of Raufarhólshellir showing Stalagmite#Ice stalagmites|ice stalagmites and part of the metal walkway thumb|Detail of the cave wall, showing bathtub rings and red-on-black coloration Raufarhólshellir () is the fourth-longest lava tube in Iceland. The cave's proximity to Reykjavík made it popular with visitors, who caused damage to the cave. In late 2016 the cave was closed to the public to clear accumulated garbage and install lighting and a walkway to part of the cave. The cave reopened for guided tours the following year.

group of blowholes in Samoa

cave in Oregon

natural sub-surface lava tube cavern on Mars, believed to form as result of fast-moving basaltic lava flows

Tajogaite or Tajogaite Volcano () is a monogenetic cinder cone located in the municipality of El Paso on the island of La Palma, Canary Islands. It originated in the eruption that began on September 19, 2021, the most recent on the island and in the national terrestrial geography. It stopped on December 13, 2021, after 85 days of activity, being the longest historical eruption recorded on the island and third in the archipelago.

cave

Volcanic cave of Mount Etna in Sicily, Italy

cave in Japan

volcanic submarine lava tube in the Canary Islands

lava tube system on the South-Korean island Jeju