Rio Grande de Cagayan
| Cagayan River | |
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Drainage area of the river and its tributaries in northeastern Luzon
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| Native name | Bannag |
| Other name(s) | Rio Grande de Cagayan |
| Country |
 Philippines
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| Island | Luzon |
| Region | Cagayan Valley |
| Province | Cagayan, Isabela, Nueva Vizcaya, Quirino |
| Basin features | |
| Main source |
Caraballo Mountains 1,524 m (5,000 ft) 16°11′08″N 121°08′39″E / 16.18556°N 121.14417°E |
| River mouth |
Babuyan Channel, Aparri 0 m (0 ft) 18°20′N 121°37′E / 18.333°N 121.617°ECoordinates: 18°20′N 121°37′E / 18.333°N 121.617°E |
| Basin size | 27,753 km2 (10,715 sq mi) |
| Tributaries |
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| Physical characteristics | |
| Length | 350 km (220 mi) |
The Cagayan River, also known as the Rio Grande de Cagayan, is the longest river in the Philippines and the largest river by discharge volume of water (followed by Rio Grande de Mindanao). It has a total length of approximately 350 kilometres (220 mi) and a drainage basin covering 27,753 square kilometres (10,715 sq mi). It is located in the Cagayan Valley region in northeastern part of Luzon Island and traverses the provinces of Nueva Vizcaya, Quirino, Isabela and Cagayan.
The river's headwaters are at the Caraballo Mountains of the Central Luzon at an elevation of approximately 1,524 metres (5,000 ft). The river flows north for some 350 kilometres (220 mi) to its mouth at the Babuyan Channel near the town of Aparri, Cagayan. The river drops rapidly to 91 metres (299 ft) above sea level some 227 kilometres (141 mi) from the river mouth. Its principal tributaries are the Pinacanauan, Chico, Siffu, Mallig, Magat and Ilagan Rivers.
Magat River, is the largest tributary with an estimated annual discharge of 9,808 million cubic meters. It lies in the southwestern portion of the basin, stretching approximately 150 kilometres (93 mi) from Nueva Vizcaya down to its confluence with Cagayan River about 55 kilometres (34 mi) from the river mouth.
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Wikipedia