It covers an area of 3,403.62 hectares (8,410.5 acres) in northeastern Cagayan province straddling the municipalities of Lal-lo and Gattaran.

[1] The park was established as a game refuge and bird sanctuary on 15 August 1947 covering an initial area of 4,554 hectares (11,250 acres) declared through Administrative Order No.

[3] The park is a component of the Northeastern Cagayan Key Biodiversity Area and also contains the Lal-lo and Gattaran Shell Middens, a proposed World Heritage Site.

[4] It is drained by several streams including the Magapit, Nassiping and Dummun rivers which empty into the Rio Grande de Cagayan.

Its hilly landscape provides a habitat for diverse bird species such as swifts, hornbill, white-breasted sea eagle, amethyst brown dove, fantails, wagtails, sunbirds, herons, egrets, plovers, Philippine duck, bee-eaters, Philippine bulbul, and yellow-vented bulbul.