Aomi Island, located in Yamaguchi Prefecture's Kita-Nagato Kaigan National Park, is one of the best diving spots in Japan. The attraction is that you can enter the sea directly from the beach, making it safe and enjoyable even for beginners. Because this beach is a gravel beach, the sand does not roll up easily, and it boasts a stable high level of transparency. Although facing the Sea of Japan, the topography is bay-shaped, and the shallow waters and relatively gentle currents make for an easy diving environment. Blue underwater caves can be seen in several places, and the scenery is out of this world beautiful.