The 13th line is located on the south bank of the junction of the Vale and Haikou in Bali District, Xinbei City. After the geologist Lin Zhaoxu confirmed the discovery of prehistoric ironmaking relics here in 1957, it was named the 13th line site. Afterwards, many archaeologists excavated here, unearthing various rich relics such as pottery, ironware, tombs and other objects. After research, it is learned that 13 pedestrians lived 1,800 years ago, belonging to Taiwan's prehistoric iron age, and are currently one of the prehistoric residents who have determined to have ironmaking technology.