- Pyeongneung-dong, Donghae-si
According to the Samguk Yusa (Memorabilia of the Three Kingdoms), there was a place to send fire or smoke signal in Mt. Chorokdang, northwest of Pyeongchon-ri.
Currently, there is a mountain named Chorokbong (531m above the sea level), 4km west to the village(Pyeongchon-ri). Considering that, it is estimated that related historic remains would be in the mountain. But a field investigation has not been made yet.