Vanishing Falls, Karst waterfall in Southwest National Park, Tasmania, Australia.
Vanishing Falls is a waterfall in Southwest National Park where the Salisbury River plunges 70 meters down a dolerite plateau before disappearing underground. The water drains into a limestone cave system beneath the surface.
The formation developed as water gradually eroded the limestone layer beneath the dolerite plateau over geological time. This erosion carved out a natural drainage system that channels water directly into subterranean caves.
Geologists and researchers from the University of Tasmania study this location to understand the processes of karst formation in the region.
Reaching this waterfall requires a demanding multi-day trek through remote wilderness without established trails, suitable only for experienced hikers. Visitors should prepare for difficult terrain, dense forest, and changing weather conditions.
What makes this site remarkable is that under normal conditions the water completely vanishes into the underground cave and the streambed below remains dry. Water only flows in the lower channel during heavy floods.
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