Chamseongdan- Korean LocationLocation · Landmark
Also known as: 참성단 and 塹星壇
Description
Stone altar atop Mani Mountain on Ganghwa Island, built by Dangun to offer sacrifices to his grandfather Hwanin. Its square base and circular platform embody the principle of cheonwon jibang, round heaven, square earth. Ritual fires are still lit here on Gaecheonjeol, Korea's National Foundation Day.
Mythology & Lore
The Altar on Mani Mountain
The Chamseongdan stands on the summit of Mani Mountain (마니산) on Ganghwa Island, built according to tradition by Dangun Wanggeom as a site for offering sacrifices to his grandfather Hwanin, the Lord of Heaven. Its name means "Altar for Worshipping the Stars."
The altar consists of a square stone base surmounted by a circular upper platform, embodying the cosmological principle of cheonwon jibang (천원지방): round heaven, square earth. The circular section is Heaven, the square base is Earth, and the altar stands where they meet. Mani Mountain's summit, at roughly 469 meters the highest point on Ganghwa Island, places the altar as close to the sky as the island allows.
Fire on the Mountain
The Chamseongdan has drawn officials and priests for centuries. During the Goryeo and Joseon dynasties, state-sponsored ceremonies were held here in times of national crisis. When the Goryeo court retreated to Ganghwa Island during the Mongol invasions of the thirteenth century, the altar stood within reach, and officials performed rites seeking heavenly protection for the besieged kingdom.
Today, ritual fires are lit at the altar every October 3rd for Gaecheonjeol (개천절), National Foundation Day, accompanied by traditional music and offerings. The fire commemorates Hwanung's descent from Hwanin's heaven, the event that set the founding of Gojoseon in motion.
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