Tetrapods, Yonaguni Island, Japan

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Tetrapods are a type of concrete structure used to protect coastal structures and prevent erosion caused by waves. They are typically made up of four arms that extend outward from a central point, resembling the limbs of a tetrapod (a four-limbed animal). Yonaguni Island is located in the Yaeyama Islands of Japan, near Taiwan. It is known for its unique underwater rock formations, including the Yonaguni Monument, which some believe to be a man-made structure dating back thousands of years. The island is also famous for its crystal-clear waters, making it a popular destination for scuba diving and snorkeling. The use of tetrapods on Yonaguni Island is common, as they help protect the coastline from the strong waves and currents in the area. These structures are often seen lining the shores of the island, providing stability and protection for the land behind them.