The grand mushroom reef is located in the Shilang sea area. The reef is 8 meters from the top and 18 meters to the bottom.

The main feature is to appreciate the microporous coral group that survived for thousands of years. Because the shape looks like mushrooms, it is named the big mushroom. In 2016, due to the strong typhoon, the towering large mushrooms were dumped, but the various fish and corals on the large mushrooms are still endless.