Lake Maughan occupies the steep-sided walls of the 2.9-km-wide Parker summit caldera of , also known locally as Falen. This vegetated edifice overlooks Sarangani Bay near the southern tip of Mindanao Island and is surrounded by extensive, young pyroclastic flow deposits. This volcano was the source of a major explosive eruption in 1641.

Photo courtesy of PHIVOLCS.

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Parker