As the mountainous area is mostly on the eastern part of the peninsula, the main rivers usually stream westwards. Two exceptions are classified as the southward-flowing Nakdong River and Seomjin River.
A few from the commanderies fell or retreated westward inside of a number of decades, although the Lelang Commandery remained as being a 토토 Centre of cultural and economic Trade with successive Chinese dynasties for four generations. By 313, Goguryeo annexed each of the Chinese commanderies.