Yonaguni is the southernmost island of Japan's Ryukyu Islands and is located near the Taiwan Strait. It is known for its beautiful landscapes, including rugged coastlines, lush forests, and unique marine life. The island has a small population and is primarily engaged in fishing and agriculture. One of the most intriguing features of Yonaguni is the Yonaguni Monument, an underwater structure that some believe to be a man-made site. This submerged formation has sparked debates among researchers and divers about its origins, with theories ranging from natural geological processes to ancient human construction.