Photographer's Note

Undara lava tubes inland from Cairns and Townsville have one of the biggest collection of lava tubes in the world. Lava flowed from volcanoes along depressions with the upper parts cooling first allowing the hotter inner flow to keep going, and creating the tubes, some of which are up to 30km long.
Here you can see an arch when 2 sections of the roof have collapsed. The arch is dried lava.
If you think that the vegetation looks a bit like rainforest it is but it is what is called dry rainforest getting plenty of rain in the wet season but drying out through the rest of the years.
You can walk through (with guide only) several of the tubes and it does get very dark inside.
In the wet season some of the tubes get flooded with water and people swim through them
There are plenty of little bats living in the tubes.
Because of the uneven light this photo is a merged set of 3 bracketed photos.
As always best viewed in the large version.

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Additional Photos by Ian Fegent (ifege) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1014 W: 77 N: 2864] (13338)
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