Introduction to the piebald colored stone: The piebald colored stone is a rectangular sea stack with a total volume of 7,000 cubic meters. It is a basic volcanic rock-tuff that was erupted by the Cambrian volcano and is 500 million years old. It has been hailed as a scenic spot in Dadong since ancient times. In recent years, it has been hailed as "the most amazing stone in the sea of China". It is located in Lianluo Bay, Madao Town, northeast of Rongcheng City.