[1] The Tago River headwaters from the Diwata Mountain Range in Sibagat, Agusan del Sur.

It traverses along the barangays of Kolambugan and Padiay in Sibagat; the riverbank barangays of Bitaugan, Bagyang, Calatngan, Carromata, Sagbayan, Poblacion, Baras and Libas Gua (all in the municipality of San Miguel, Surigao del Sur); and barangays of Badong, Alba, Bangsud, Anahao Bag-o, Anahao Daan, Gamut, Camagong, Unaban, Unidos, Purisima (all in the municipality of Tago, Surigao del Sur) where its mouth located in Barangay Poblacion meet with the Philippine Sea of the Western Pacific Ocean.

It originates in the City of Cabadbaran, Agusan del Norte, and the municipality of Sibagat, Agusan del Sur, and traverses the entire length of the basin in an easterly direction and discharges into the Philippine Sea.

[5] The Tago River Watershed, covering a total area of 143,770 hectares, has its Headwaters originating from the northwestern portion of Diwata Mountain Range located in Sibagat in the Province of Agusan del Sur.

Shortly after leaving the main forest concession and upon reaching the flood plains of San Miguel, the waters draining from the Tago River and its tributaries are tapped by a National Irrigation Administration (NIA) diversion dam for irrigating some 14,000-ha of rice fields in the San Miguel–Tago area.