The Simuay River is a river in the Philippines with its source at Lanao del Sur in the Piapayungan range, and its mouth at is at Illana Bay through the Mindanao River.
| Simuay River | |
|---|---|
  .svg) | |
| Location | |
| Country | Philippines |
| Region | Maguindanao, Bangsamoro Autonomous Region |
| Physical characteristics | |
| Source | Piapayungan Range |
| • location | Mount Ragang |
| • elevation | 9,236 ft (2,815 m) |
| Length | 81 km (50 mi) |
| Basin size | 627 km2 (242 sq mi) |
7°16′N 124°14′E / 7.267°N 124.233°E
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