Why Tomogashima?
友ヶ島(ともがしま)
The Tomogashima Islands have a long history, dating back to ancient times when they were used as a training place for Buddhist aesthetic rites. In the past century, weapons batteries were constructed on these islands, as well as a naval lookout point.
Many of these historical legacies remain existent today as a testament to the islands' rich past. There is a campground, a visitor's center, cliffs, caves, as well as an abundance of wildlife. Tomogashima remains one of the best places in the area to take a day trip to hike around the island and enjoy the outdoors.
The Tomogashima Islands are located just off the Kada coast and are accessible via a regular ferry service that leaves from Kada Port.
Source from:https://www.city.wakayama.wakayama.jp/english/destinations.html#tomogashima