Hokakejima Rocks are so named due to their resemblance to the sail of a sailboat. With a height of 30m, it is the largest rock formation on Oga Peninsula.
The Futago (Twin) Rocks are two similar rocks right next to each other. From a high angle, you can see where magma flowed into the stone to form a dike, and from sea level, you can see the bedrock.
Nearby are many other rock formations such as Godzilla's Tail Rocks, Gamera Rocks, and Turtle Rocks. Another interesting sculpture created by nature.