Callao Cave
Peñablanca, Philippines
Adventure
Callao Cave is one of 300 limestone caves located in the Barangays of Magdalo and Quibal in the municipality of Peñablanca, about 24 km northeast of Tuguegarao City, the capital of Cagayan province within the Peñablanca Protected Landscape and Seascape in the western foothills of the Northern Sierra Madre Mountains on Luzon island in the Philippines. The town Peñablanca's name refers to the predominance of white limestone rock formations in the area.
From Wikipedia, CC BY-SA 4.0
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