page_title: Ilagan River
hierarchical_section_title: Ilagan River
caption_attribution_description: English: Aerial view of Benito Soliven (foreground) and San Mariano (background), Isabela Province, Philippines
context_page_description: 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 3,132 square kilometres and an estimated annual discharge of 9,455 million cubic meters/s. It flows westward and joins the Cagayan River at Ilagan City, Isabela.
context_section_description: 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 3,132 square kilometres (1,209 sq mi) and an estimated annual discharge of 9,455 million cubic meters/s.  It flows westward and joins the Cagayan River at Ilagan City, Isabela.
caption: Ilagan River as it passes through the municipalities of San Mariano (background) and Benito Soliven (foreground).
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