《史记·七十列传·朝鲜列传》
汉朝建国后，因为朝鲜离得远，难以守卫，所以重新修复辽东郡以前的那些关塞，一直到浿水为界，属燕国管辖。
汉兴，为其远难守，复修辽东故塞，至浿水为界，属燕。
After the Han dynasty was established, since Korea was far away and difficult to defend, the Han dynasty restored the old fortresses of Liaodong Commandery, extending its boundaries as far as the Mei River and placing it under the jurisdiction of the state of Yan.