Welcome to one of inland Queensland's most dramatic natural features. About 190,000 years ago, the Undara shield volcano erupted, sending molten lava coursing through the surrounding landscape. While the surface of the lava cooled and hardened, hot lava continued to race through the centre of the flows, eventually leaving the world’s longest continuous (though fragmented) lava tubes from a single vent. Seen from above it's a series of perfectly formed volcanic craters rising above the forest. Down at ground level, it's an intricate, fascinating world ripe for exploration.