The park also extends to the nearby municipalities of San Ildefonso and Doña Remedios Trinidad covering a total area of 2,117 hectares (5,230 acres).

[1] It was declared a national park in 1937 by President Manuel L. Quezon by virtue of its association with the history and site of the Biak-na-Bato Republic.

Situated only 80 kilometers (50 mi) northeast from Manila, it is fast becoming a popular weekend eco-adventure destination for the city dwellers.

In September 2004, eight people, seven of which were children and teenagers, drowned in Madlum River in Biak-na-Bato National Park.

[7] On August 19, 2014, seven people, all tourism college students of the Bulacan State University who had their field trip at the area,[8] were killed by raging floodwaters at the Madlum River.