Because the mountainous region is totally on the japanese Section of the peninsula, the key rivers have a tendency to flow westwards. Two exceptions are the southward-flowing Nakdong River and Seomjin River.

Although the Sui army was lured into a lure from the famed Koguryŏ commander Ŭlchi Mundŏk, and experienced a calamitous defeat with the Salsu (Ch'ŏngch'ŏn) River. It is said that only two,seven hundred of the three hundred,000 Sui soldiers 슬롯 who experienced crossed the Yalu survived to discover their way again, plus the Sui emperor now lifted the siege of Liao-tung Fortress and withdrew his forces to China correct. Yang Ti ongoing to ship his armies against Koguryŏ but yet again with out achievements, and ahead of long his war-weakened empire crumbled." ^