Daikonshima Island – 大根島

The flat island of Daikonshima is one of the nation's most reputable producers of Japanese peonies and ginseng. Otsuka-yama Hill (a volcanic cone) offers a panoramic view of the island.

The basalt that the island is made up of, a blackish volcanic rock, is dotted with many little holes and is considered a precious material in the area. The volcanic island has two underground lava tunnels. One of them, called Ryukeido, and designated as national natural monument, can be visited with a Shimane Prefecture Home Guide (0852-76-2397). More information in this English PDF.