The Pratu Ma is located along Highway 1035 heading northeast out of the Lampang city. The information on site states that Khelang Nakorn City was establish in 679 A.D. Along its conch shaped boundary, a wall was built, 4.4 km long with seven gates. The northern gate was known as Pratu Ma. Excavations by the Fine Arts Department have revealed that the wall was built in three periods starting in the Lanna Period, 14th Century and reinforced during the Lanna/Ayutthaya Wars a century later.