page_title: Northern Sierra Madre Natural Park
section_title: Geography
hierarchical_section_title: Northern Sierra Madre Natural Park / Geography
caption_attribution_description: English: View of the forested west coast of Isabela Province (Dinapique). Photo: MVW.
context_page_description: The Northern Sierra Madre Natural Park is the largest protected area of the Philippines covering the northern range of the Sierra Madre mountains of eastern Luzon. The park is located in the eastern part of the province of Isabela in Cagayan Valley containing a total of 359,486 hectares. It was first declared a wilderness reserve encompassing an area within a 45 kilometres radius of Palanan Point known as the Palanan Wilderness Area through Letter of Instructions No. 917-A signed by President Ferdinand Marcos on 7 September 1979. On 10 March 1997, the area was converted into a natural park with the signing of Proclamation No. 978 by President Fidel Ramos.
  The park is considered the richest in terms of genetic, species and habitat diversity in the Philippines. It is one of the country's ten priority protected areas managed by its own Protected Area Management Board headed by the Regional Executive Director of the Department of Environment and Natural Resources for Region II under the rules set forth in Article III of Republic Act 9125, also known as the Northern Sierra Madre Natural Park Act of 2001.
context_section_description: The Northern Sierra Madre Natural Park lies in the midsection of the Sierra Madre mountain range which stretches from the province of Aurora to Cagayan. It consists of 287,861 hectares (711,320 acres) of land area and 71,652 hectares (177,060 acres) of coastline water area corresponding geographically with the Isabela municipalities of Palanan, Divilacan and Maconacon, as well as portions of San Mariano, Dinapigue, San Pablo, Cabagan, Tumauini and the city of Ilagan. It is bounded on the north by the Dikatayan River, on the south by the Disabungan River, on the west by Cagayan Valley, and on the east by the Philippine Sea.
  The park is characterized by high mountains with very steep slopes in the central portion of the range and relatively low hills with dominantly moderate steep slopes towards the coast. Mount Cresta on Sierra Madre's western flank is the highest peak in the park with an elevation of 1,672 metres (5,486 ft). The second highest is Mount Divilacan with an elevation of 1,311 metres (4,301 ft) located on its eastern flank.
  Northern Sierra Madre is drained by 14 major river systems, 11 of which empty into the Philippine Sea and 3 flow into the Rio Grande de Cagayan as tributaries of the Ilagan River. Palanan River, with a drainage area of 63,571 hectares (157,090 acres) or 29% of the park's total area, is the most extensive, followed by Abuan River and Catalangan River.
caption: The Pacific coast of Dinapigue in the Northern Sierra Madre Natural Park
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