Kazumura Cave
Hilo, HI
Adventure
Kazumura Cave is a lava tube and has been surveyed at 40.7 miles long and 3,614 feet deep, making it the longest and deepest lava tube in the world. The cave is located on the island of Hawaiʻi on the eastern slope of Kīlauea.
From Wikipedia, CC BY-SA 4.0
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