Travelling Australia
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Undara
 
Large lava tube
Lava Tube Section
Undara shield
Undara Shield
Colours
Tube Colours
Scoria cone
Scoria Cone
Long lava tube
Long Lava Tube
Open tube
Tube Wall
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Undara Volcanic National Park encloses a long lava tube system formed 190,000 years ago when molten lava pouring from a large volcano flowed along a river bed. The top layer of lava cooled and hardened into a crust while molten lava below continued to flow leaving a series of hollow tubes. In later years the tube roof collapsed in places allowing animals, birds and bats to take shelter. Tourist access to the tubes is controlled because of the risk of injury to people wandering away from known safer parts and to prevent damage to the tubes.