The Marbel River, also known as the Marbol River and the Sulphur River, is a river in the province of Cotabato in the Philippines.

It is located at the foot of Mount Apo.

The Marble River connects to the Kabacan River in Cotabato, a tributary of the Pulangi River which empties into the Rio Grande de Mindanao in Cotabato City.

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