Their distribution shows that these dolmen were closely related to fishing in the Bronze Age, although they are now separated from the sea.

[4] Dangun, the founder of Gojoseon, is said to have made an altar on top of Mani-san and offered sacrifices to his ancestors.

On 9 November, the French were checked when they attempted to occupy the strategically important Cheondeung (Jeongdeung–sa) Temple, on the island's south coast.

In 1875, the Japanese ship, Unyo, made and incursion into the restricted coastal zone, under the guise of measuring the coastline.

Early in the following year, Japan sent a large Imperial Japanese Navy fleet to Korea, which forced the government to sign the unequal Treaty of Ganghwa.

That agreement, concluded on Ganghwa Island, officially opened Korea to Japanese external trade for the first time during the 19th century.

Under an order given by the royal court of the Joseon dynasty over 100 years ago, craftsman Han Chunggyo from the white-mat producing village, Yango-ri, Haesongmyeon, Ganghwa-gun, achieved a successful product by the design of his own idea.

In three regions of South Korea including Hwasun and Gochang, Ganghwa's dolmens are famous sites to study ancient culture.