The highest peak in Marinduque is Mount Malindig (formerly called Mt. Marlanga), a potentially active stratovolcano with an elevation of above sea level, located at the southern tip of the island. Various cave systems occupy the province, which include the grand Bathala Cave; the newly discovered San Isidro Cave with its complex subterranean river; and Talao Caves with its 12 series of caves overlooking the western part of the island.