Mikura-jima (御蔵島) is located amongst the islands of the northern Izu-shotō, situated 17 km south-southeast from Miyake-jima and 77 km north from Hachijo-jima.

Mikura-jima is the eroding remnant of a basaltic-to-andesitic stratovolcano that has been dormant for the last 6,000 years. Roughly circular in shape, the island has a maximum diameter of 5.5 km and a circumference of 16 km, covering an area of 20.5 km².

Like most of the islands of the Izu-shotō, Mikura-jima rises sharply from the sea via cliffs and very steep, grassy slopes that rise directly from the sea or from short rocky beaches strewn with rounded boulders. The dissected interior rises to 851 m above sea level at the summit of O-yama. Major topographical features include the deep V-shaped valley that descends from Mt. O-yama to the cliffs of the southern coast (at right in the above image) and the 800 m high ridge that curves from O-yama to the east coast.

Mikura-jima's thick vegetation cover has been little disturbed by human activity and comprises secondary forest, evergreen forest, highland forest and grassland.

Synonyms: Mikura-jima, Mikurajima, Mikura Island, Mikurashima

image: earth sciences and image analysis laboratory, nasa johnson space center

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