Ganghwa Island, also known by its native name Ganghwado, is a South Korean island in the estuary of the Han River. It lies in the Yellow Sea off Korea's west coast, separated from Gimpo on the South Korean mainland by a narrow channel spanned by two bridges and from Kaesong in North Korea by the main channel of the Han River.
The island is strategically located, controlling access to the river which runs through the former Joseon and present South Korean capital Seoul. Its fortifications were repeatedly attacked during the 19th century. With an area of 302.4 km2, it now constitutes most of Ganghwa County, a division of Incheon Municipality. It has a population of about 65,500 people, half of whom live in Ganghwa Town on the northeast.
Wikipedia https://en.wikipedia.org/wiki/Ganghwa_Island
Address South Korea
Coordinates 37°42'20.935" N 126°26'37.253" E