The Rio Grande de Cagayan is the longest river in the Philippines, stretching approximately 505 kilometers. It flows through the northern 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 north. It plays a crucial role in the local ecosystem and supports various wildlife. This river is vital for agriculture, providing irrigation to the surrounding farmlands. It also serves as a transportation route for local communities. The Rio Grande de Cagayan is an essential resource for fishing and other livelihoods, contributing to the economy of the region.