Mount Panay is a low andesitic stratovolcano on the Calumpang Peninsula west of the Batangas Bay, south of Lake Taal. Panay was mapped as Pleistocene in age by the Philippine Bureau of Mines (Wolf and Self, 1983), but displays strong solfataric activity. Batangas Bay lies at the intersection of two major regional trends, the Bataan Lineament and the Palawan-Macolod Lineament, and may represent a submarine caldera.