The Chonghae earthen fort is situated in Thosong-ri, Pukchong County, South Hamgyong Province.
It was built by exploiting the natural and geological conditions of the area. According to survey, the remaining wall of the fort is 2-3 metres high, 1 metre wide in the upper part and about 8 metres wide in the lower part. And the fort had a gate, pavilion and many bastions.
There are traces of a moat around the wall.
The fort was originally 2 132 metres in circumference, but the existing wall is 1 342 metres round. It is partitioned in the shape of a cross by the straight roads extending from east to west and from north to south. Sites of government office building, houses, temple, military barracks, wells and ponds have been discovered. Besides, unearthed were weapons, ceramics, cart fittings, harness, personal ornaments and Buddhist remains that date back to the period of Palhae, a feudal state in Korea which existed from the late 7th century to the early 10th century.
Various kinds of relics including those related with ondol (Korea’s traditional under-floor heating system) and wells are the same as those of the Palhae period which were unearthed in other regions in terms of shape, material and pattern.
These facts prove that the Chonghae earthen fort dates back to the period of Palhae and that a government office building was in it.
Distributed around the fort are many relics from the period of Palhae including a cluster of over 600 tombs in Phyong-ri, temple and mountain fortress.
The fort is of great academic significance in the study of the ruling system and fort defence system in the period of Palhae.
Ho Jin Myong, a researcher of medieval archaeology laboratory of the Academy of Social Sciences
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