Gangdong District (Gangdong-gu) is one of the 25 gu which make up the city of Seoul, South Korea. Gangdong is literally "east of the (Han) River". It is located on the east side of the city.Jungbu (literally "Central Part") Express Motorway starts in and passes through Sangil-dong, which is located in the east end of this district. In Amsa-dong, there is a Pre-historic heritage site which is about six thousands years old. At this site, there are many kinds of pottery and houses.