Chestnut Island[1]) is a pair of islets in the Han River in Seoul, South Korea.

The uninhabited islets, with a total area of about 0.24 km2 (0.093 sq mi) and length of 1,147 m (3,763 ft), are located between the larger island of Yeouido, to which they were once connected,[2] and the north shore.

Additionally, Bamseom is an excellent place for children living in the city to experience nature.

[5] Banseom's waters are a spawning and nursery ground for many Korean indigenous fish, including Acheilognathus yamatsutae, Acanthorhodeus gracilis, and Sarcocheilichthys nigripinnus morii.

Bamseon is the primary location in the 2009 Korean film Castaway on the Moon in which a man (Jung Jae-young) decides to commit suicide by jumping into the Han river, only to find himself washed ashore and stranded on the island.