Where was Ji, the capital of Yan State during the Spring and Autumn Period and the Warring States Period?

Yan and Ji were the names of two feudal countries in Beijing in Shang and Zhou Dynasties, and they were also the earliest recorded city names in Beijing. After Zhou Wuwang destroyed the Shang Dynasty (65438 BC+0046 BC), in order to consolidate the political power, he was enfeoffed as a vassal. "Tianfu Guangji" records: "Zhou was named Yan, and later Yao was named Ji." Historians regard Yan Ji as the beginning of the completion of written records in Beijing Bay. Yan Dou is located in Dong Jialin Village, Liu Lihe Town, Fangshan District, southwest of Beijing today ... Ji Cheng is located more than 20 miles around Guang 'anmen in southwest of Beijing today.