
East
Quirino Protected Landscape: Exploring the Sierra Madre and Cagayan River Watershed
Mountainous forest geography in the province of Quirino
Spanning roughly two thirds of the province of Quirino, this protected landscape is a strategic natural feature of northern Luzon. Defined by the confluence of the Sierra Madre and Caraballo mountain ranges, it serves as a massive reservoir for the Upper Cagayan River. The terrain consists of dense rainforest ridges, deep river valleys, and isolated peaks, playing a central role in regional biodiversity and watershed conservation.
- Area
- 1,759.44 km²
- Established
- 2004
- IUCN
- V
- Relief
- Mountain






