11038 (Expanded National Integrated Protected Areas System Act of 2018) signed by President Rodrigo Duterte in July 2018.

[5] Aliwagwag is situated in the Eastern Mindanao Biodiversity Corridor which contains one of the largest remaining blocks of tropical lowland rainforest in the Philippines.

[2] A tributary of the Cateel River which includes the Aliwagwag Falls flows through the park from the 1,660-metre (5,450 ft) high Mount Agtuuganon in the Diuata Range or Mindanao Pacific Cordillera.

Its forest is home to the Philippine eagle as well as several other threatened and endemic bird species such as the Visayan miniature babbler, little slaty flycatcher and Lina's sunbird.

In the waters of the upper Cateel River, a rare species of fish can be found called sawugnun by locals which is harvested as a delicacy.