Ganghwa Island (Korean: 강화도), also Ganghwado, is an island in Ganghwa County, Incheon, South Korea. It is in the Yellow Sea and in an estuary of the Han River.
The island is separated from Gimpo (on the South Korean mainland) by a narrow channel spanned by two bridges, and from Kaesong (Gaeseong) in North Korea by the main channel of the Han River. It offers some of the closest views in the South of North Korean villages, which can be seen on clear days from less than two kilometers.
A megalith is a large stone that has been used to construct a prehistoric structure or monument, either alone or together with other stones. More than 35,000 megalithic structures have been identified across Europe, ranging geographically from Sweden in the north to the Mediterranean Sea in the south.
The word was first used in 1849 by the British antiquarian Algernon Herbert in reference to Stonehenge and derives from Ancient Greek μέγας (mégas), meaning "great", and λίθος (líthos), meaning "stone". Most extant megaliths were erected between the Neolithic period (although earlier Mesolithic examples are known) through the Chalcolithic period and into the Bronze Age.
Ganghwa County (Korean: 강화군; RR: Ganghwa-gun) is a county in Incheon, South Korea. The county is composed of Ganghwa Island and the minor islands around it.
The Ganghwa Island incident or the Japanese Battle of Ganghwa (Korean: 운요호 사건 [雲揚號事件] Unyo-ho sageon meaning "Un'yō incident"; Japanese: 江華島事件 Kōka-tō jiken) was an armed clash between the Joseon dynasty of Korea and Japan which occurred in the vicinity of Ganghwa Island on September 20, 1875.