Hinagdanan Cave is a cave 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 cave is within easy reach. You’ll have to walk through dense vegetation of just about one kilometre. 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.