Dayang Mountain and Xiaoyang Mountain face each other across the sea, located 39.6 kilometers to the northeast of the county town of Caiyuan and 35 kilometers to the northwest of Luchao Port in Nanhui County, Shanghai. The island, shaped like a propeller, stretches 4 kilometers from east to west, with a width of 1.3 kilometers at the southern end and 200-300 meters at the northern part. It covers a land area of 4.19 square kilometers and has a coastline of 16.7 kilometers. Surrounded by mountains, the island features a more open valley in the middle, with the highest peak reaching an elevation of 204 meters.

Dayang Mountain is renowned for its peculiar rocks and stone inscriptions on cliffs. There are crevice caves formed by granite, known as Dao Tian Dong, which are quite unique as they lead to the mountain summit above and extend into the sea below.






