Iwahig River
The Iwahig River, also known as Balsahan River, is a watershed located in the Iwahig Penal Colony in Palawan, Philippines. It has an elevation of with an approximate length of The river basin is a watershed encompassing the city of Puerto Princesa in Palawan province.
Topography
The basin area has a gentle a slope to steep slopes with an elevation range of to more than above sealevel. Soil types includes Guimbalaon clay, Taburos clay and Bay clay loam. The basin's large area are unclassified with its mountainous land with a closed canopy of trees that covers almost the entire basin.