Because there is a river in Yongjia, which is rich in nanmu.

The Nanxi River basin is famous for its water, rocks, waterfalls, ancient villages, and beautiful beaches and forests, and the Nanxi River Scenic Spot is the only scenic spot with idyllic landscapes among China's national scenic spots.

Nanxi River was honored as a national 4A tourist area by the National Tourism Administration in 2002.

Nanxi River, during the Warring States period, used to be the only river flowing into the sea, and in modern times, it is the largest tributary of the lower reaches of the Ou River. It originates from Huanglikeng East (a place said to be west of Luo Yangling in Xixia Township, Yongjia County, when it is a border with Xianju County) in the northwest of Yongjia County. , the source elevation of 840 meters (one said the source elevation of 1192 meters), the formation of surface water flow elevation of 1030 meters, flowing south to Shao Keng.

Folding southeast flow through the white rock, Nanyan to Xikou, left Na originated in Xianju, Yongjia, Huangyan three-county border of the rocky Tan Creek, south to Tiekeng, folding east flow through the Baojiang to Fuyao, left Na Zhang Creek folding south to the port head, left Na Donggao Creek southwesterly flow through the head of the rock, the stone columns to the ditch under the Tan, the right Na Xiaonan Creek began to be called the Nanjiang River, the River meanders southward through the mouth of the ancient temples, the face of the mouth to the Yongjia County Town (on the Tong Town). Continuing to meander southward through Huangtian to Yongjia County Oubei Town Qingshui port into the Oujiang River.