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The Kanohina Cave System is an extensive network of lava tubes on the island of Hawaii, USA, highly notable for its complex maze-like passages and unique biology.
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Stóra-Víðgelmir is a lava-tube cave in the Hallmundarhraun lava field of western Iceland, near Húsafell. The passage is about 1.6 kilometres long, and Víðgelmir is recognized as the largest known lava cave in Iceland; its interior preserves lava formations and other geological features that interest...
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