Mount Mandalagan is a

complex volcano A complex volcano, also called a compound volcano or a volcanic complex, is a mixed landform consisting of related volcanic centers and their associated lava flows and pyroclastic rock. They may form due to changes in eruptive habit or in t ...

located at latitude 10.65° North (10°39'0"N), longitude 123.25° East (123°15'0"E), in the

province A province is almost always an administrative division within a country or state. The term derives from the ancient Roman '' provincia'', which was the major territorial and administrative unit of the Roman Empire's territorial possessions ou ...

Negros Occidental Negros Occidental ( hil, Nakatungdang Negros; tl, Kanlurang Negros), officially the Province of Negros Occidental, is a Provinces of the Philippines, province in the Philippines located in the Western Visayas Regions of the Philippines, region. ...

, on the north of the island of

Negros Negros is the fourth largest and third most populous island in the Philippines, with a total land area of . Negros is one of the many islands of the Visayas, in the central part of the country. The predominant inhabitants of the island region a ...

of the

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

. It is located inside the

Northern Negros Natural Park The Northern Negros Natural Park is a protected area of the Philippines located in the northern mountainous forest region of the island of Negros in the Visayas. It is spread over five municipalities and six cities in the province of Negros Occide ...

. Mandalagan is a

solfataric A fumarole (or fumerole) is a vent in the surface of the Earth or other rocky planet from which hot volcanic gases and vapors are emitted, without any accompanying liquids or solids. Fumaroles are characteristic of the late stages of volcani ...

fumarolic A fumarole (or fumerole) is a vent in the surface of the Earth or other rocky planet from which hot volcanic gases and vapors are emitted, without any accompanying liquids or solids. Fumaroles are characteristic of the late stages of volc ...

, potentially active stratovolcano. Mandalagan is also known as Nahigda nga Babayi or Lying Women for the Bacolodnons and Negrenses.

Physical Features

Elevation is 1885 metres (6,184 feet), with a base diameter of 26 kilometres. Mandalagan is a deeply dissected

, with a highly altered

volcanic dome In volcanology, a lava dome is a circular mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano. Dome-building eruptions are common, particularly in convergent plate boundary settings. Around 6% of eruptions ...

. Volcanic activity is reported to include seven volcanic centres, at least five craters and/or calderas up to 2 km in diameter, and a vigorous solfataric area at the highly altered

structure. One solfataric area emits a high-temperature (106 degrees C) plume to 30 m height with a roaring noise like a high-pressure geothermal borehole.

Images

The Smithsonian listing has a satellite photograph of the general area.

Geological Features

Mandalagan is part of the Negros Volcanic Belt. Rock type is principally andesitic with some dacitic A crater located near the center called "Tinagong Dagat", where hikers camp.

Eruption

The most recent eruption produced a thin basaltic lava flow, but it is not known when this is likely to have occurred.

Listings

Philippine Institute of Volcanology and Seismology (PHIVOLCS) lists Mandalagan as potentially active. The Smithsonian Global Volcanism Program lists Mandalagan as fumarolic.

External links