Because the mountainous region is totally on the japanese A part of the peninsula, the main rivers usually stream westwards. Two exceptions are classified as the southward-flowing Nakdong River and Seomjin River. Even so the Sui Military was lured right into a trap through the famed Koguryŏ commander Ŭlchi Mundŏk, https://cruz8zy5k.blogoscience.com/40196931/rumored-buzz-on-korea