楽浪郡
Lelang Commandery was a commandery of the Han Dynasty established after conquering Wiman Joseon in 108 BC and lasted until Goguryeo conquered it in 313. The Lelang Commandery extend the rule of the Four Commanderies of Han as far south as the Han River (Korea), which largely follows along the boundary between modern day North and South Korea. South Korean scholars have described its administrative areas as being limited to the Pyongan and Hwanghae regions, whose southern bounds lie roughly 75 miles North of the Han River.