The Six Frontier Towns (Traditional Chinese:六鎮; Simplified Chinese:六镇), also known as Northern Frontier Towns (北镇), refers to six military towns in the Hetao region that Northern Wei government built during Huangshi era and Yanhe era to prevent the southward invasion by Rouran. These towns were Woye, Huaishuo, Wuchuan, Fumin, Rouxuan and Huaihuang (from west to east).
The town of Woye was located in the old city of Woye of Han Dynasty, southwest of today's Linhe Country of Inner Mongolia at first, but later move to Shuofang of Han Dynasty, north of today's Hangjin Banner. The town of Huaishuo was located in southwest of today's Guyang, Inner Mongolia. Later its name was changed to Shuozhou. The town of Wuchuan was located in west of today's Wuchuan Country, Inner Mongolia.
In 528, it became a district (郡). The town of Fumin was located in southeast of today's Siziwang Banner. The town of Rouxuan was located in northwest of today's Xinghe Country. The town of Huaihuang was located in northwest of today's Chicheng Country.