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Philip Rooney

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The Sierra Madre a 690 km (430 miles) is the longest mountain range in the Philippines. Through the north–south direction from Santa Ana in the province of Cagayan to the north and Bondoc Peninsula in Quezon to the south, the mountains form the eastern backbone of Luzon Island, the largest island of the archipelago. It is bordered by the Pacific Ocean to the east. The Pacific coast of Luzon along the Sierra Madre is less developed as the lofty and continuous mountains form a bold and almost inaccessible shore, exposed to the full force of the northeast monsoon and the waves of the Pacific Ocean. Some of communities east of the mountain range and along the coast are so remote they are only accessible by plane or boat. The country's largest protected area, the Northern Sierra Madre Natural Park, is situated at the northern part of the range in the province of Isabela. The park is in the UNESCO tentative list for World Heritage List inscription. Environmentalists, scholars, and scientists have been urging the government to include the other parks within the Sierra Madre mountains for a UNESCO site that would encompass the entire Sierra Madre mountain range from Cagayan to Quezon province.

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Sierra Madre (Philippines)
The Sierra Madre a 690 km (430 miles) is the longest mountain range in the Philippines. Through the north–south direction from Santa Ana in the province of Cagayan to the north and Bondoc Peninsula in Quezon to the south, the mountains form the eastern backbone of Luzon Island, the largest island of the archipelago. It is bordered by the Pacific Ocean to the east. The Pacific coast of Luzon along the Sierra Madre is less developed as the lofty and continuous mountains form a bold and almost inaccessible shore, exposed to the full force of the northeast monsoon and the waves of the Pacific Ocean. Some of communities east of the mountain range and along the coast are so remote they are only accessible by plane or boat.
Sierra Madre

Columbanus