Ganghwado Island, off the west coast, is the fifth largest island in Korea. The island was connected to the mainland in 1970 with the construction of the Ganghwagyo Bridge. Another larger bridge, Ganghwadaegyo Bridge, was built in 1997, making it easier than ever to travel to Ganghwado Island from Seoul and Incheon areas. The island is home to Chamseongdan Altar on top of Manisan Mountain on the southern coast. This
