Azuki-iwa (Azuki Beans) Rocks

Unosaki Beach is dotted with spherical rocks known as Azuki Bean Rocks. Because of their pretty shape, they are also called Oboko Rocks (oboko meaning “small child”). Formed from a mixture of mud and minerals such as calcium and magnesium, these hard rocks are not very noticeable during high tide, when only the tops of their heads are visible, but they can be seen in full during the early spring tide.