Gimnyeong Cave, Manjanggul Cave, Natural lava tube in Jeju Island, South Korea.
Manjanggul is a lava tunnel on Jeju Island that extends deep underground with dark basalt walls throughout. The interior displays various rock formations and lava patterns that show how volcanic activity created this underground space.
The tunnel formed between 200,000 and 300,000 years ago when lava flows from the volcano Geomunoreum carved this underground route. The geological processes that happened then continue to define how the place looks today.
The cave's name comes from the extended underground passage that locals have known about for centuries. Today, visitors walk through to see how volcanic forces have shaped this natural space and to observe the distinctive rock patterns and formations that mark the passage.
Visitors can walk about one kilometer into the cave on safe marked pathways to explore different sections. The temperature stays around 11 to 16 degrees Celsius year-round, so bringing warmer clothing is a good idea.
The cave houses a lava column about 7.6 meters tall that stands out as a rare geological feature. This massive rock formation is easy to spot as you walk through and impresses with its unusual size.
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