Mount Iō
硫黄岳
Aerial view of Iōjima with Mount Iō steaming.(February 2008)
Highest point
Elevation	703.7 m (2,309 ft)[1]
Prominence	704 m (2,310 ft)
Listing	List of mountains and hills of Japan by height
Coordinates	30°47′35″N 130°18′19″E / 30.79306°N 130.30528°E / 30.79306; 130.30528[1]
Naming
English translation	Sulphur Mountain
Language of name	Japanese
Geography
Location	Iōjima, Kagoshima Prefecture, Japan
Parent range	Kikai Caldera
Topo map(s)	Geographical Survey Institute, 25000:1 薩摩硫黄島, 50000:1 開聞岳
Geology
Rock age	Holocene
Mountain type	Stratovolcano
Volcanic arc	Ryukyu arc
Last eruption	June 2013

Mount Iō, (硫黄岳, Iō-dake) also known as Mount Iwo, is an active rhyolitic lava dome on Iōjima in Kagoshima Prefecture, Japan. It sits within the borders of the town of Mishima.

The mountain is made up of non-alkali felsic rock and pyroclasitic flows.^[2]

• VolcanoWorld - Kikai, Kyūshū, Japan
• S. Hamasaki, Volcanic-related alteration and geochemistry of Iwodake volcano, Satsuma-Iwojima, Kyushu, SW Japan, Earth Planets Space, pp 217–229, 2002, Tsukuba, Research Center for Deep Geological Environments, Geological Survey of Japan, AIST,

• Satsuma-Iojima - Japan Meteorological Agency (in Japanese)
• "Satsuma-Iojima: National catalogue of the active volcanoes in Japan" (PDF). - Japan Meteorological Agency
• Satsuma-iojima - Geological Survey of Japan
• Kikai - Geological Survey of Japan
• "Kikai". Global Volcanism Program. Smithsonian Institution. Retrieved 2021-06-24.

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