The Simuay River is a river in the Philippines with its source at
Lanao del Sur
Lanao del Sur (; Meranaw and ; Jawi ''(Batang Arab)'': ), officially the Province of Lanao del Sur, is a province in the Philippines located in the Bangsamoro Autonomous Region in Muslim Mindanao (BARMM). The capital is the city of Marawi (th ...
in the
Piapayungan range, and its mouth at is at
Illana Bay
Illana Bay, also known as Iranun Bay, is a large bay of the Moro Gulf, off the southwestern coast of Mindanao island in the Philippines
The Philippines, officially the Republic of the Philippines, is an Archipelagic state, archipelagic co ...
through the
Mindanao River
The Rio Grande de Mindanao, also known as the Mindanao River, is the second-largest river system in the Philippines. Located on the southern island of Mindanao, with a total drainage area of , draining the majority of the central and eastern po ...
.
Rivers of the Philippines
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