Introduction to Stone Pillar Forest: The large cliffs on Nanding Island are all composed of rows of high-hanging basalt stone pillars. Even the cobblestones on the ground are formed by collapsed stone pillars under the action of the waves. The cliffs The rock wall from the cave entrance to the top are all basalt pillars whose surfaces have been washed smooth and smooth by the waves. The basalt columnar joints inside the cave are also very clear and easy to distinguish.