Sierra Cave, Cagayan Valley
September 2nd 2017 Cagayan was dubbed as the "Caving Capital of the Philippines", and Sierra cave is one of the 300 caves in Cagayan that have been documented by the National Museum of the Philippines.
Sierra cave is a better-preserved and a less visited cave also within the Callao Ecotourism Zone,
It is known for it's many interesting and beautiful geological formations. Fossilized specimens are also seen emb
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