The Rio Grande de Mindanao is the longest river in the Philippines, flowing through the southern region of Mindanao. It stretches approximately 373 kilometers and serves as a vital waterway for the surrounding communities. The river originates from the Mount Apo area and meanders through various towns before emptying into the Sulu Sea. This river plays a crucial role in the local ecosystem and economy. It supports agriculture by providing irrigation to nearby farmlands and serves as a source of fish and other aquatic resources. The Rio Grande de Mindanao is also significant for transportation, connecting different regions within Mindanao.