Gangdong-gu (literally "district east of the river")'s one of the 25 gu which make up the city of Seoul, South Korea. It's located on the east side of the city. Jungbu(literally "Central Part") Express Motorway starts in and passes through Sangil-dong, which's located in the east end of this district. In Amsa-dong, there's a Pre-historic heritage site which's about six thousands years old. At this site, there're many kinds of pottery and houses. The pottery which has been found was made of cera… (More on Gangdong-gu)