Geltenbachhöhle, Natural cave system in Bern, Switzerland
Geltenbachhöhle is a cave system in limestone formations in the Bernese Oberland with over 3000 meters of mapped passages. The tunnels vary in width and create a complex underground maze shaped by water flow over thousands of years.
The cave was first successfully explored in 1979 after initial attempts the previous year. Since then the system has been systematically surveyed and mapped, with new sections discovered over time.
The cave draws researchers and geologists who study the complex water movements and geological formations within the Gastern Valley karst system.
Reaching the cave requires climbing skills and experience with ropes, as the entrance sits high on a rock face. Inside, temperatures stay cold year-round, so warm clothing and sturdy footwear are essential.
An underground waterfall forms in this cave system when heavy rains or snowmelt trigger water flow through the karst passages. This rare sight transforms the cave into an active environment where water power shapes the stone.
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