玄菟郡
Xuantu Commandery (玄菟郡, 현도군) was a commandery of the Han dynasty. It was one of Four Commanderies of Han, established in 107 BCE in northern Korean Peninsula and part of the Liaodong Peninsula, after the Han dynasty invaded Wiman Joseon of Korea. Korean kingdom of Goguryeo rose in this area in competition with the Chinese over the region. Although Goguryeo gained full control over the general region in 302, Later Han had already lost the earlier territory of Xuantu, which retreated to Liaodong Peninsula in the 1st century CE. The populations of the respective prefectures were greatly reduced after they were transferred to Liaodong, but their prefectural identities were preserved albeit nominally.