The stone marker at the Taga Castle site is one of the most remarkable monuments in Japanese history as it gives distances to ancient places that no longer exist. It shows that these places not just existed at one time, but also distances to these places relative to Taga Castle. So this marker is a remarkably reliable historical source that testifies about places from that time when it was first carved and erected in AD 762. From this we know that the Emishi frontier was located 120 li, approximately 60 kilometers (37.28 miles) north of Taga Castle. This translates exactly to the distance to where present day Kurihara City is located. From this we know that it is accurate as this area is where Korehari no kimi Azamaro was based, and was at that time the frontier where the Japanese state and the Emishi territory met. The translation for the first several lines giving place names and distances reads as follows (conversions are approximate):
Distance to miyako (Kyoto) one-thousand, five-hundred li (750 kilometers, 466 miles).
Distance to Emishi country border one-hundred, twenty li (60 kilometers, 37.28 miles).