Formerly a barrio of Casiguran, the municipality of Dinalungan was created in 1966. It is bounded on the north by the Dinalungan River, on the south by the Dinadiawan Creek, on the west by the provinces of Quezon and Nueva Vizcaya, and on the east by Casiguran Sound.

     The municipality of Dinalungan is located between the mountains of Dipaculao and Casiguran. Trees abound in its mountain areas, where forests and falls dominate the landscape, and rare exotic birds, such as the endangered Philippine Eagle, soar over untrammeled coastline. Because of its variety of natural attractions, the area is ideal for nature trekking.