According to legend, there was a reef in Nanhai Bay of Dongjun Island in Song Dynasty, named Ma Lao Mountain. The Yang family, whose ancestral home is now Tanghuo Village, Chishan, saw that the mountain is a treasure trove of geomantic omen, so they sent Zhao Deyu, who is skilled in martial arts, here to bury the ashes of his ancestors. After receiving the order, Zhao went home and told his mother that her mother put Zhao Deyu's father's ashes in a bran cake and gave them to Zhao, ready to steal the column for herself. It is said that Zhao Deyu can breathe with his cheeks and has amphibious skills. After entering the water, Zhao Xian threw his father's ashes into the dragon's mouth, and Shilong immediately shut up. In a panic, Zhao Deyu pried open the Longkou with a wooden stick, but the wooden stick broke into the Longkou. Zhao had no choice but to hang Yang Zu's urn on the Dragon Horn. It is said that because of this, Yang Jiacai produced Yang Jiye, the "hanging general", while the Emperor of the Song Dynasty produced Zhao Jiacai.
Yangjia buried reef is 1.5km offshore and 13.3m high. Seen from the front, it looks like a pen rack on the sea. Looking southwest, it looks like a warship at sea. Seen from the northeast, it looks like a sedan chair walking on the sea. Whenever the fog just disappears in early spring, there are often mirages, sometimes animals, sometimes plants, sometimes pavilions and so on. Strange and varied.