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Mount Apo is a large solfataric potentially active stratovolcano on the island of Mindanao in the Philippines. It is the highest mountain in the country and overlooks Davao City-40km northeast, Digos City-25km southeast, and Kidapawan City-20km west. Its name means "master" or "grandfather". Apo is flat topped, with three peaks, and is capped by a 500 m wide volcanic crater containing a small crater lake. It is a source of geothermal energy, but the date of its most recent eruption is unknown, and none are verified in historical times.

Mount Apo is one of the most popular climbing destinations in the Philippines, and the summit is easy to reach. The first recorded climb was on October 10, 1880Don Joaquin Rajal by a party led by