The United States expedition to Korea, known in Korea as the Shinmiyangyo or simply the Korean Expedition, was an American military action in Korea that took place predominantly on and around Ganghwa Island in 1871.

Ganghwa Island (Korean: 강화도), also known by its native name Ganghwado, is a South Korean island in the estuary of the Han River. It is in the Yellow Sea, off Korea's west coast. The island is separated from Gimpo by a narrow channel spanned by two bridges, and from Kaesong (Gaeseong) in North Korea by the main channel of the Han River. North Korea can be seen on clear days from less than two kilometers away on South Korea's Ganghwa Island allowing better views of North Korean villages than from elsewhere in South Korea.