"Gungnae City (hanja: \u570B\u5167\u57CE ), also known as Guonei City, was a fortress-city second capital city of the ancient kingdom of Goguryeo (modern Ji'an, Jilin, China). and the perimeter of its outer fortress measures 2,686m. It is part of Capital Cities and Tombs of the Ancient Koguryo Kingdom, a World Heritage Site."@en .