Cannabis Ruderalis October 12, 2016 thcscience_admin Yanghwacheon is a river of South Korea. It is a river of the Han River system.[1] References[edit] ^ Chʻoe, Yŏng-jun (2005). Land and Life: A Historical Geographical Exploration of Korea. Jain Publishing Company. p. 4. ISBN 978-0895818355.