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Hinagdanan Cave is a cave in the municipality of Dauis on Panglao Island, in Bohol Province, in the Philippines. It is a naturally lighted cavern with a deep lagoon and many large stalactites and stalagmites.
The cave is lit by sunlight which filters through holes in the ceiling. The underground lake is a popular swimming spot, but it has been known to test for high levels of various pollutants, since it is fed by ground runoff.
Hinagdanan Cave is made of limestone. The entrance of the cave is a hole of about 1 metre wide in diameter, visible from a limestone hill. Cemented steps lead to the interior of the cave. The cave is slippery, but there's a railing made of rope to hold on to avoid accident due to slippery stones of the cave. The cave is filled with sleeping birds in small holes in the ceiling. The sunlight that permeates is unsuitable for bats.
Hinagdanan Cave was accidentally discovered when the owner of the area was clearing the decaying branches of the land when he found the hole. The owner threw a stone into the hole, then he heard a splash. Then he built a ladder to get into the cave. They named it Hinagdanan, means "laddered" used to get into the cave's interior.
The cave is about 100 metres long of beautiful rock formations. The stalactites and stalagmites stick out from the ceiling and floor of the cave as though trying to meet each other. Inside the cave, there's also a lagoon with a greenish surface produced by the green limestone at the bottom of the pool, where people used to bath in the lagoon, however, it has been advised to not go dip into the lagoon because of the karst pollutants present in the water.
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