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In the vast savannah of Australia’s North Queensland, 300 km southwest from the city of Cairns, lies the Undara Volcanic National Park where you will find some of the largest and longest lava tubes on the planet.

The Undara lava tubes were formed in a massive eruption that occurred about 190,000 years ago causing lava to flow more than 90 km to the north and over 160 km to the north-west. During this fiery episode, 23 billion cubic liters of lava was estimated to have spewed forth from the Undara Volcano onto the surrounding Atherton Tableland. As the lava flowed, the outer-layer cooled and formed a crust, while the molten lava below drained outwards, leaving behind a series of hollow tubes. The roofs of some of the tubes have collapsed, allowing vegetation to flourish in the damp interiors and shelter wildlife.

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Photo credit: www.travelonline.com

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