Bodagrottorna, Nature reserve in Hudiksvall Municipality, Sweden.
Bodagrottorna is a cave system in Hudiksvall Municipality featuring over 2800 meters of underground passages. The tunnels wind through massive boulders and narrow crevices carved between towering rock walls.
The cave system formed approximately 9000 years ago when a powerful earthquake fractured the bedrock during rapid land uplift following the ice age. These tectonic shifts left their mark on the landscape.
Local geologists and researchers study the cave system to understand the tectonic movements and geological processes that shaped the Swedish landscape.
Bring two light sources, sturdy footwear, and warm clothing to navigate safely through the passages. The best time to explore runs from July through October.
The cave passages follow straight patterns through crystalline rock, creating a natural underground maze beneath the surface. Some sections descend to depths of about 5 meters.
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