The 고인돌, which is known as dolmen in English, is a structure usually made of three stones. Many of these are found in Europe, however, around 40% of all dolmen in the world are found in Manchuria and the Korean Peninsula (mostly the northern part of the peninsula). It is not known why these are disproportionately located in Korea but they comprise part of mysterious lineage to prehistory in Korea. While often these are thought to be tombs or related to burials, there is no definitive evidence for this.
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