Introduction to Longshui Ridge: With an altitude of 110 meters, it is the commanding height of Donghai Island. The mountain has lush vegetation and is full of greenery. It is a natural "green mark" for ships entering and leaving Zhanjiang Port. There are abandoned fortifications built in the 1960s inside the mountain, which penetrate the mountainside. The structures are ingenious and unmemorable, making it a new place for tourists to climb and explore.