Its four major lowland plains are the central plain and the Cagayan valley in Luzon, and the Agusan and Cotabato valleys in Mindanao. These lowlands contrast sharply with the adjacent high mountain areas of the central and east Cordilleras and the Zambales mountains.
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Its four major lowland plains are the central plain and the Cagayan valley in Luzon, and the Agusan and Cotabato valleys in Mindanao. These lowlands contrast sharply with the adjacent high mountain areas of the central and east Cordilleras and the Zambales mountains.