Lelang Commandery
The Lelang Commandery was a commandery of the Han dynasty established in Old Chosŏn after defeating the Wiman dynasty in 108 BCE and lasted until Goguryeo conquered it in 313 CE. The Lelang Commandery extended the rule of the Four Commanderies of Han as far south as the Han River in present-day 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.