The Marble River (also known as Marbel, Marbol River, 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.

Marbel River Marble River Marbol River Sulphur River
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Location
Country	Philippines
Region	Soccsksargen
Province	Cotabato
Physical characteristics
Source	foot of Mount Apo
Mouth	Kabacan River
• coordinates	7.12023°N 124.88469°E / 7.12023; 124.88469
Basin features
Progression	Marbel–Kabacan–Pulangi–Mindanao