Davao-Agusan Trough To the west of the Pacific Cordillera lies an extensive lowland, the Davao-Agusan Trough. Its northern portion includes the Agusan Valley which forms the lower river basin of the Agusan River. The river flows in a northward direction and empties into Butuan Bay. Draining the southern portion of the lowland are several other rivers, which include the Tagum, flowing southward to Davao Gulf.
Davao-Agusan Trough To the west of the Pacific Cordillera lies an extensive lowland, the Davao-Agusan Trough Its northern portion includes the Agusan Valley whic.h forms the lower river basin of the Agusan River. The river flows in a northward direction and empties into Butuan Bay. Draining the southern portion of the lowland are several other rivers, which include the Tagum, flowing southward to Davao Gulf