Ilagan River
Introduction The '''Ilagan River''' 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  and an estimated annual discharge of 9,455 million cubic meters/s. It flows westward and joins the Cagayan River at Ilagan City, Isabela.
Tributaries The Ilagan River at Ilagan CityThe major tributaries of Ilagan River are:* Abuan River – originates from the mountains in the Northern Sierra Madre National Park where one of the widest tropical rainforests in the Luzon can be found. * Bintacan River
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