It originates in the Nueva Vizcaya municipality of Aritao, where the Santa Fe River joins the Marang.

It is the largest tributary of the Cagayan River by discharge volume of water, with an estimated drainage area of 5,200 square kilometres (2,000 sq mi), roughly twenty percent of the total drainage area of the Cagayan River.

The following are the tributaries of the Magat River by length: The Magat River Integrated Irrigation System Project, started by the National Irrigation Administration in the 1960s, is one of the Philippine's largest irrigation projects with hydroelectric power generation capacity.

[1] The project is made up of the Magat reservoir, three diversion dams, a large number of irrigation canals and three pumping stations to supply irrigation water for an area of about 97,400 hectares (974 km2).

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