In the history of the Warring States period, the territory of South Korea was basically fixed in today's Shanxi and Henan areas. Of course, in the late Warring States period, especially after the battle of Changping, South Korea gradually lost its territory in present-day Shanxi Province, that is, South Korea at that time, and its territory was mainly concentrated in present-day Henan Province.
Because the territory of South Korea only includes parts of Shanxi Province and Henan Province, the whole territory of South Korea is very limited, thus becoming the smallest of the Seven Heroes in the Warring States Period.
Extended data:
Korea (403- 230 BC), a vassal state in the pre-Qin Dynasty, was one of the Seven Heroes in the Warring States Period. It is also called Sanjin with Wei and Zhao. The monarch is the Han family of Ji, and is the descendant of Han Wuzi, the doctor of the State of Jin (the uncle of Emperor Wu of Jin).
In 453 BC, the doctors of Han, Zhao and Wei in the State of Jin, for the battle of Jinyang, destroyed Zhi Bo Xunyao and carved up the land of Jin. In 403 BC, Dr. Han, Dr. Zhao, and Dr. Wei were recognized by King Wei Lie of Zhou, and they officially became princes. Korea has its capital in Yangzhai (now Yuzhou, Henan).
In 375 BC, Han Aihou destroyed the State of Zheng and established Xinzheng (now Xinzheng, Henan) as its capital. 325 years ago, Wei Huiwang and Han Xuanhui (Han) met in Wusha and were honored as kings. In the first 230 years, South Korea was destroyed by the State of Qin, and its old place was Yingchuan County.