Original sentence: Guonei City was a city on Yalu River's plain, while Weina Rock City(尉那巖城) was the city in the mountain which was later renamed to Wandu(丸都) by Sansang of Goguryeo.In Volume 13(page 18) of Samguk Sagi, it is said "(瑠璃王)二十二年冬十月，王遷都於國內，築尉那巖城"(English translation: On October of the 22nd year (of Yuri of Goguryeo), the Yuri King moved the capital to Guonei, and built the Weina Rock City).In Volume 16(page 21) of Samguk Sagi，it is said "(山上王)二年二月築丸都城"(English translation: On February of the 2nd year (of Sansang of Goguryeo), Wandu City was built).In page 23 of the same volume, it is said "(山上王十三年)十月，王移都于丸都"(English translation: On October (of the 13th year of Sansang of Goguryeo), the Sansang King moved the capital to Wandu).Since the 1st year of Sansang of Goguryeo is 197 AD, the 2nd year is 198 AD and the 13th year is 209 AD.Since the 1st year of Yuri of Goguryeo is 19 BC, the 22nd year is 3 AD.The remain of this city is a UNESCO World Heritage Site located in 2.5 kilometers to the west of Ji'an, Jilin, China.Wandu Mountain City (Chinese: 丸都山城), along with Guonei City, served as the second capital of Goguryeo (Chinese: 高句麗；Pinyin: Gaogouli)
Edited sentence: It is based on the ruins of Hwando Fortress that served as the second capital of Goguryeo (Chinese: 高句麗；Pinyin: Gaogouli) along with Guknae Seong(Pinyin: Guoneicheng).Wandu Mountain City (Chinese: 丸都山城) is a UNESCO World Heritage Site located in 2.5 kilometers to the west of Ji'an, Jilin, China