Introduction to the reef: The rocks on the reef are masterpieces of wind, rain and waves. They are either page-shaped, cone-shaped, prism-shaped, or column-shaped. The color is burnt brown at most, ranging from blood red, iron black, and black. Green, earthy yellow, milky white. On the seaside side of the reef, the bottom has been "bitten" by the waves so much that it seems as if the whole thing is about to topple over. No one dares to lean down and look down. To ensure the safety of tourists, stone railings have been set up along the edge of the island.