The symmetrical Matutum stratovolcano rises to 2286 m in southern Mindanao, NW of Sarangani Bay.  The summit of the andesitic-to-dacitic volcano is truncated by a well-preserved 320-m-wide crater that is breached by three gorges and has a 120-m-deep, densely forested floor.  Widespread silicic pyroclastic-flow deposits surround the volcano, which overlooks the major city of General Santos.  The youngest pyroclastic deposits were dated at about 2000 yrs BP.  A report stated that Matutum volcano was "smoking" on March 7, 1911 (Neumann van Padang, 1953).  The Akmoan and Lianan thermal areas are located on the WSW flank of the volcano.