Under the Beilun River Bridge in Fangchenggang, Guangxi, stands a century-old boundary marker, which is Qinzhou No. 5 boundary marker established during the reign of Emperor Guangxu.

This is a must-visit place for self-driving tours, because the zero-kilometer starting point of Fangchenggang City is also here. The zero-kilometer starting point is Zhushan Village, Dongxing Town, Dongxing City, Fangchenggang City. This location is located at the intersection of land and sea in southern China. It is also the estuary of the Beilun River, the boundary river between China and Vietnam, and the starting point of the border highway. It is located at the southernmost tip of the mainland coastline and border of the motherland, across the sea from Mong Cai, Vietnam. Whether you are traveling by land border or by car along the coastline, the starting point is here.