The Sierra Madre, extending along the Pacific coast from northern to central Luzon, is the longest mountain range in the country. That range and the Cordillera Central merge in north-central Luzon to form the Caraballo Mountains. To the north of the latter, and between the two ranges, is the fertile Cagayan Valley.
2.Joining the Kabacan River, it becomes the Mindanao River. Flowing out of the mountains, it forms the center of a broad, fertile plain in the southcentral portion of the island.
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Rio Grande de Mindanao Tamontaka River Cotabato River Pulangi River
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1. Sierra Madre
The Sierra Madre, extending along the Pacific coast from northern to central Luzon, is the longest mountain range in the country. That range and the Cordillera Central merge in north-central Luzon to form the Caraballo Mountains. To the north of the latter, and between the two ranges, is the fertile Cagayan Valley.
2.Joining the Kabacan River, it becomes the Mindanao River. Flowing out of the mountains, it forms the center of a broad, fertile plain in the southcentral portion of the island.
...
Rio Grande de Mindanao Tamontaka River Cotabato River Pulangi River