Dayushan Island, with a diameter of about 5 kilometers and an area of 2 1.22 square kilometers, is the largest island in eastern Fujian, with the highest point of Hongji Dongshan at an altitude of 54 1.4 meters. There are beautiful scenery on the island, such as colorful lake water, sunset glow of ant boat, grotesque patterns on the beach, Tianshan Mountain in the south and clear sky on the cape. In the blue sea of the East China Sea, 200 meters above sea level, there are two lakes, large and small, so it is called "the lake on the sea". The peaks around the lake are arched like bowls, hence the name Yushan Island. Datian Lake covers an area of nearly 1,000 mu and can be used for boating. Xiaotianhu covers an area of more than 200 mu. The two lakes are separated by 1000 meters, each with its own spring, which is inexhaustible all year round. The water is as sweet as a mirror. Shiny because of the sun, wrinkled because of the wind, sometimes Bai Ou Ji Xiang. The hillside around the lake is gentle, forming a grassland of 10,000 mu in Tianshan Mountain, which is rich in grassland scenery of "the sky is grey, the wild is vast, the wind blows grass is low, and the cattle and sheep are low".