Yongcheon Cave, Limestone lava tube cave in Jeju, South Korea.
Yongcheon Cave is a lava tube system in Jeju that winds through the rock over large distances and includes several interconnected passages. The main corridor forms the largest passage, while smaller side tunnels lead to various chambers and underground areas.
The cave formed thousands of years ago through the activity of lava flows and was only officially recognized in modern times. The discovery allowed research to show that people had visited this place since very early times.
The cave entrance takes its name from the ancient region, and visitors can see traces of earlier inhabitants who left their marks here. These archaeological hints show that people used this underground space over many centuries.
Entry requires descending on a ladder, which is manageable for most visitors but takes some care and time. The temperature inside stays the same throughout the year, so warm clothing is wise even when it is hot outside.
Hidden deep inside the cave lies an underground lake that has long been studied and harbors rare water creatures. These special organisms have adapted to life in total darkness and cannot be found anywhere else.
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