Tomogashima

The four islands are Jinoshima (地ノ島), Kamishima (神島), Okinoshima (沖ノ島), and Torajima (虎島).

The folklore of the region holds that Ennogyoja, the founder of shugendo, underwent training on the steep cliffs of Tomogashima in the seventh to eighth centuries.

[1][5] Also during this time gun batteries and other defences, along with various support facilities, were constructed to counter foreign warships.

Access to the cluster by the public was strictly prohibited by the Imperial Japanese Army up to the end of World War II.

[6] Tomogashima is the subject of a scroll of 1661 in the Shōgo-in in Kyoto by Kanō Tan'yū as well as an anonymous work of 1798 in the British Museum.