No photo available for this volcano
Google Earth icon
  Google Earth Placemark
  • Malaysia
  • Indonesia
  • Pyroclastic cone
  • Unknown - Evidence Uncertain
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 4.4°N
  • 117.88°E

  • 531 m
    1742 ft

  • 269010
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Bombalai.

The Global Volcanism Program has no Weekly Reports available for Bombalai.

The Global Volcanism Program has no Bulletin Reports available for Bombalai.

Volcano Types

Pyroclastic cone

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Basalt / Picro-Basalt
Andesite / Basaltic Andesite


Within 5 km
Within 10 km
Within 30 km
Within 100 km

Geological Summary

Mount Bombalai is part of a large Pliocene to Pleistocene or younger volcanic field on the Semporna Peninsula in the NE part of the island of Borneo. The volcano is part of the Malaysian province of Sabah, across Cowie Harbor from the the Indonesian province of Kalimantan. The low volcanic cone is located north of Sebatik Island and has a roughly 300-m-wide crater breached to the south. Two young lava flows extend almost to the coastal plain. The flows were considered younger than a lava flow radiocarbon dated at about 27,000 years before present, and the extrusion of basaltic lavas possibly continued into Recent (Holocene) time (Kirk, 1968). This marks the only known area of possible Holocene volcanism on Borneo. Other areas of late Quaternary dacitic and basaltic volcanism occur along the Semporna Peninsula.

The Global Volcanism Program is not aware of any Holocene eruptions from Bombalai. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Bombalai page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.


Feature Name Feature Type Elevation Latitude Longitude
Mostyn Cone

The Global Volcanism Program has no photographs available for Bombalai.


The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.

Kirk H J C, 1968. The igneous rocks of Sarawak and Sabah. Geol Surv Borneo Region Malasia Bull, 5: 1-220.

Macpherson C G, Chiang K K, Hall R, Nowell G M, Castillo P R, Thirlwall M F, 2010. Plio-Pleistocene intra-plate magmatism from the southern Sulu Arc, Semporna peninsula, Sabah, Borneo: implications for high-Nb basalt in subduction zones. J Volc Geotherm Res, 190: 25-38.

Affiliated Databases

Large Eruptions of Bombalai Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.