Sierra Madre - a mountain range in the Philippines , the longest mountain system in the country - 340 km. Located on the island of Luzon , where it stretches along the east coast in the northern part of the island. It passes through the territory of several provinces: Kagayan , Isabela , Nueva Viskaya , Quezon .
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The highest point is Monte Anacuao, 1850 m. From the west, the system adjoins the lowlands, the valley of the Cagayan River, which separates it from the opposite mountain system, the Central Cordillera.