Because the mountainous region is totally on the jap Section of the peninsula, the key rivers often flow westwards. Two exceptions are the southward-flowing Nakdong River and Seomjin River.
3 of the commanderies fell or retreated westward in just a handful of many years, 파라곤 even so the Lelang Commandery remained as a Heart of cultural and economic Trade with successive Chinese dynasties for four hundreds of years. By 313, Goguryeo annexed all the Chinese commanderies.