Ōnohara-jima

Ōnohara-jima, Izu-shotō

Situated 8.5 km west from Miyake-jima are a collection of steep-sided islets, rocks and stacks known as Ōnohara-jima (大野原島); they are often referred to as Sanbondake (in reference to the three tallest islets, "three peaks", that are readily visible from Miyake-jima).

There are nine main islets and several smaller emergent rocks with a total land area estimated at 2 hectares. Formed largely from andesitic lavas, the islets are the eroded remnants of one or more lava domes. The tallest rises to a height of 114 m above sea level.

image: National Land Image Information (Color Aerial Photograph), Ministry of Land, Infrastructure and Transport, Japan ©

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