Sierra Cave

Sierra Cave is a natural limestone cave located in Barangay Quibal, Penablanca, Cagayan, within the Peñablanca Protected Landscape and Seascape in northeastern Luzon. It is one of more than 300 caves documented in the municipality and is known for its stalactite and stalagmite formations, narrow passages and chambers. Managed as part of the protected area, it is visited for guided caving and nature appreciation alongside nearby Callao Cave.

Visitors can expect a guided caving experience inside a natural limestone cave with chambers, narrow passages, stalactites and stalagmites. The cave is set in forested karst landscape within the Peñablanca Protected Landscape and Seascape. Access requires a short trek and climbing, with low light conditions inside. Exploration is on foot with helmets and lights, accompanied by a local guide, and focuses on rock formations and cave ecology.

Sierra Cave is part of the Penablanca cave system within the Peñablanca Protected Landscape and Seascape, an area known for archaeological and paleontological significance, including Pleistocene faunal remains and evidence of early human activity documented in nearby Callao Cave.