Aoshima, Miyazaki

The island has a surface area of 4.4 hectares (10.9 acres) and a height of 6 metres (20 feet).

[1] The island is surrounded by unique rock formations referred to as the Ogre's Washboard (鬼の洗濯板, Oni no Sentakuita).

The island is covered with the world's northernmost self-reproducing population of the fan palm, Livistona chinensis (Arecaceae), and is one of two places in Japan with a virgin forest of this indigenous species.

Precipitation is significant throughout the year, and is heavier in summer, especially the months of June and July.

The Ogre's Washboard is visible from the Nichinan Line, and the Umisachi Yamasachi will slow to allow passengers to take pictures and for an announcement on the feature to take place.