[1][2] It is a tributary of the Sibagat River with headwaters located in the hinterlands of Barangays Perez and Sta.

[3] Terrain elevation at these coordinates is estimated 413 metres above sea level.

[1] The river streams from the mountainous areas of Barangays Perez, Sta.

[4] The Tambagoko River including its surrounding areas comprising most of the barangays of Sibagat town was indexed by the Bureau of Soils and Water Management (BSWM) of the Department of Agriculture (Philippines) as one of the Land Resources Strategic Production Areas for Cacao production in the province of Agusan del Sur and Caraga Region.

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