Biak-na-Bato National Park, National park in Bulacan, Philippines
Biak-na-Bato National Park is a protected area in Bulacan, Philippines, covering a mountain gorge with cave systems, river passages, and walking paths in the Sierra Madre. The landscape consists of limestone rocks through which the Balaong River flows, surrounded by dense tropical forest.
President Manuel Quezon declared this area a national park in 1937, recognizing its connection to the independence movement against Spanish rule. Revolutionary troops used the caves as a refuge and command post in the late 19th century during their campaign.
The name translates roughly to "split boulder" in Tagalog, referring to how the river carved through limestone formations. Local visitors often come to see the stone where revolutionary leaders signed their pact in 1897.
The area sits about 80 kilometers northeast of Manila and offers guided tours through several caves as well as walking paths through the gorge. Visiting is possible all year, though the dry season from November to May provides the best conditions.
More than one hundred caves run through the park area, many containing crystalline mineral formations. The Bahay Paniki system houses large bat colonies that emerge at dusk.
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