Tubay has a total land area of 13,800 hectares occupies 5.33% of the total land area of the province of Agusan del Norte. The urban area covers 2.97% of the total land area while the rural areas cover the dominant 97.03%. Specifically, the top 3 barangays vis-à-vis areas covered: Barangay Tagmamarkay (19.78%), Doña Telesfora 11.41% and Sta Ana (20.5%).
Approximately 31.14 percent of the municipality’s land area has slopes of 0-3%. These areas are along the Kalinawan River that traverses the municipality from Mainit Lake towards the Butuan Bay. Areas with slope of 18% & above comprise 55.38%. These areas occupy both the eastern and western boundaries of the locality. In between these two slope categories are rolling and hilly areas that cover 13.48 percent.
Forest/timber area is 7,518.03 hectares or 54.57% while alienable and disposable area is 6,281.97 hectares or 45.43%. Total built-up area is 148.5 hectares, which is 2.36% of the total alienable and disposal lands.
Existing General Land Use
A total of 7,212.04 hectares or 52.26% of land in the municipality are forest area. The area devoted for agricultural use is 4,847 hectares or 35.12%, mineral land is 598.50 hectares or 4.34%, Body of Water is 522.96 hectares or 3.79%, open grass land is 471 hectares or 3.41 and the built-up area covers only 148.5 hectares or 1.08%