The protected landscape area stretches over the municipalities of Dupax del Norte and Dupax del Sur in Nueva Vizcaya, Maddela in Quirino, and Dipaculao in Aurora. It was established to protect the watershed around the Casecnan River, a tributary of the Rio Grande de Cagayan which flows through the mountains of central Sierra Madre, the Caraballo and Mamparang ranges. The river is used heavily for irrigation and serves much of the surrounding communities in Central Luzon and Cagayan Valley. It also supplies hydroelectric power to the region, an additional 140 megawatts of power capacity to the Luzon grid through a tunnel and powerhouse built in 2001 from the diversion weirs in the Casecnan and Taan rivers in Nueva Vizcaya near Mount Guiwan to the Pantabangan Dam in Nueva Ecija. The Casecnan Dam is considered as one of the most expensive hydroelectric plants in the country and was criticized for its adverse impact on the ecology of the protected area as well as the local community of Ilongot people (also known as Bugkalot) residing in the watershed area.