Lava tubes are conduits for lava during an eruption and can be as long as 31 miles and can be as deep as 50 feet below the surface. Below is a collection of beautiful lava tubes around the world.
Manjanggul Lava Tube – Jeju Island, South Korea
Undara Lava Tubes – Queensland, Australia
Thurston Lava Tube – Hawaii Volcanoes National Park, Big Island of Hawaii
Lava Tube in Lava Beds National Monument – California, USA
Manjanggul Lava Tube – Jeju Island, South Korea
Valentine Cave Lava Tube – Lava Beds National Monument, California
Lavacicles in Mushpot Cave Lava Tube – California, USA
Shark Tooth Stalactites – Big Island of Hawaii, USA
Lava Pillar at Manjanggul – Jeju Island, South Korea
Manjanggul Lava Tube – Jeju Island, South Korea
Lava Tube at Mojave National Preserve – San Bernardino County, California
Manjanggul Lava Tube – Jeju Island, South Korea
source: twistedsifter


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