Dangun built the Chamseongdan altar atop Mani Mountain on Ganghwa Island for offering sacrifices to his grandfather Hwanin, the Lord of Heaven. The altar remains a site of annual Gaecheonjeol ceremonies.
⚠ The Chamseongdan attribution to Dangun is Ganghwa Island local tradition, not found in the Samguk Yusa. The altar's antiquity is debated by modern scholars.
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