
A vast complex of freshwater marshes and water courses with numerous small shallow lakes and ponds in the upper basin of the Agusan River and its tributaries. The maximum depth of water is 4m. Some parts of the marsh have been converted into fish ponds and rice paddies. The rivers rise in the hills of eastern Mindanao and cause extensive flooding in the marshes from November to March. The drainage is north via the Agusan River into Butuan Bay.Fishing, some aquaculture and agriculture (mainly rice and cash crops). The region is sparsely populated because of the annual flooding of the Agusan River.


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