Which river is known as the longest and largest in the Philippines by discharge?

The Cagayan River holds the title of the longest river in the Philippines, stretching approximately 505 kilometers. Additionally, it is recognized for having the largest discharge among the rivers in the country, which means it carries the most water volume compared to others. The river drains into the Luzon Strait and flows through various provinces, contributing significantly to the hydrography and ecology of the region. Its considerable length and discharge also play a crucial role in the agricultural and economic activities of the areas it traverses, making it vital for local communities.

The other rivers mentioned, while important in their own rights, do not surpass the Cagayan River in length or discharge volume. Hence, the Cagayan River is distinguished as the most significant river in these aspects within the Philippines.