C801 sword thrust into hinterland

Luoyang City occupied the Central Plains. North was Mang Shan, south was Luo Shui, east was Luo River, and west was Guan Long. There were also mountains encircled around, with the tiger prison in the east controlling the Hangu Pass, north was You Yan, and south was Yi Que. They were known as "The mountains and rivers are arched, the situation is under the heavens"