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190,000 years ago (yesterday in geological terms), Mt Undara burped 23 cubic kilometers of molten rock (Lava) upon the surrounding landscape. To visualise that - it would have filled Sydney Harbour 4 and a bit times. The terrain was fairly gentle enabling the lava to flow at only a moderate pace resulting in the formation of a crust as the outside cooled and solidified. This crust contained the heat within the core of the flow, which continued to flow leaving behind the hollow tubes we see today.
These tubes are up to 165 kilometers in length and up to 20/30 meters in diameter. Due to decay over the ages, small parts of the roofs of the tubes have fallen in allowing entry by wildlife, and man. The sinkholes have also allowed rainwater, sunlight & air to enter - providing ideal sheltered conditions for the growth of an eco-system vastly different from the surrounding savanah. Viewed from a high point on the savanah these tubes are visible as a long line of isolated islands of the darker green of the Tropical Rainforest amongst the more lighter & drier appearance of the savanah.
Undara Experience will take you on some magnificent walks in the surrounding savanah lands as well as these tubes and point out the various forms of wildlife living within both systems - bat's, bat-eating snakes, many varieties of Kangaroo etc. What could be better than sittimng on a rocky knoll in the middle of nowhere sipping champagne and nibbling cheese & crackers while watching the sunset.
Main image credit: http://www.flickr.com/photos/philliecasablanca/