The Cagayan River is the longest river in the Philippines, stretching approximately 505 kilometers. It flows through the northeastern part of the country, primarily in the province of Cagayan. The river originates from the Cordillera Central mountain range and empties into the Babuyan Channel in the Luzon Sea. It plays a crucial role in the local ecosystem and supports various wildlife. The Cagayan River is vital for agriculture, providing irrigation to surrounding farmlands. It also serves as a transportation route for local communities. The river is known for its rich biodiversity, including several species of fish and other aquatic life, making it an important resource for fishing and tourism.