| Ilagan River | |
|---|---|
 The Ilagan River as it passes through the municipalities of San Mariano (background) and Benito Soliven (foreground). | |
.svg)  Ilagan River mouth .svg) Ilagan River (Philippines) | |
| Native name | Pinacauan De Ilagan (Ilocano) |
| Location | |
| Country | Philippines |
| Region | Cagayan Valley |
| Province | Isabela |
| Physical characteristics | |
| Source | Sierra Madre mountains |
| • location | Casiguran, Aurora, Central Luzon |
| • coordinates | 16°18′42″N 121°59′6″E / 16.31167°N 121.98500°E |
| Mouth | Cagayan River |
• location | Ilagan, Isabela |
• coordinates | 17°10′03″N 121°53′25″E / 17.16763°N 121.89039°E |
| Length | 189 km (117 mi) |
| Basin size | 3,132 km2 (1,209 sq mi) |
| Discharge | |
| • average | 270 m3/s (9,500 cu ft/s)[1] |
| Basin features | |
| Progression | Ilagan River – Cagayan River |
| Tributaries | |
| • right | |
The Ilagan River, also known as the Pinacanauan de Ilagan River,[2] is a river in the province of Isabela, Cagayan Valley, Philippines. It is one of the major tributaries of the Cagayan River, the largest river in the Philippines. The Ilagan River originates from the western slopes of the Sierra Madre and drains the eastern central portion of the Cagayan River basin. It has an estimated catchment basin size of 3,132 square kilometres (1,209 sq mi)[3] and an estimated annual discharge of 9,455 million cubic meters/s. It flows westward and joins the Cagayan River at Ilagan, Isabela.[1]
- ^ a b "The Cagayan River Basin". ABS-CBN News. Retrieved March 20, 2014.
- ^ Salgado, Pedro. "Cagayan Valley at the Arrival of the Spaniards". Cagayan Valley and Easter Cordillera: 1581-1898, Volume I. Rex Publishing. p. 7.
- ^ "Cagayan Riverine Zone Development Framework Plan". National Economic and Development Authority-Regional Development Council Region 2. Retrieved March 20, 2014.[permanent dead link]