Where did Hanzhong in ancient Guanzhong refer to?

Guanzhong, or Guanzhong Plain, refers to the Weihe River alluvial plain at the northern foot of Qinling Mountains in Shaanxi, China, with an average elevation of about 500 meters. Also known as Guanzhong basin, the loess plateau in northern Shaanxi is in the north, and the mountains and Qinba mountains in southern Shaanxi are in the south. Shaanxi is a densely populated area with developed industry and agriculture, and is known as "800 Li Qinchuan".

According to different ranges, the ancients used to call the area west of Hangu Pass Guanzhong. "The Hongmen Banquet": "Pei Gong wants to be the king of Guanzhong and make Zi Ying the phase." "On Qin": "The heart of the first emperor thought it was fixed in Guanzhong."

Guanzhong, because there is a big San Guan in the west, Hangu Guan in the east, Songguan in the north and Wuguan in the south, is a country blocked on all sides, so it is called Guanzhong. In the era of cold weapons, these four levels can be said to be guarded by one person and cannot be forced by ten thousand people. It is really impregnable. What makes the ancients value more is that the climate here is mild and humid, Jing, Wei, Feng, Waterlogging, Production, Ba, Gao and Orange.

Hanzhong is an administrative unit in Shaanxi, located at the western end of southern Shaanxi, with the same geography and culture as Sichuan. It is a small basin in the south of Shaanxi, south of Qinling and north of Bashan.

Hanzhong, named after Hanshui River. Hanshui, named after Tianhan, is the Milky Way. Ancient priests, fortune tellers and astronomers believed that after Pangu created the world, Zhu Rong and Gonggong fought, and the sky collapsed in the northwest and the ground collapsed in the southeast, forming a world with thick loess. Tianhan is located in the center of the sky and divides it into two parts. Accordingly, there should be a big river on the ground, located in the center of the earth, which divides the earth into two halves. The known world at that time: there is a big river in the north, namely the Yellow River, and there is also a big river in the south, namely the Yangtze River. Then this big river should be located between the Yellow River and the Yangtze River. They found the big river. The big river in the sky is called Han, so they named the big river on the ground Han, also called Hanshui and Hanjiang River. There is a city at the source of Hanshui River, with plain sea in the east, snow-capped mountains and Gobi in the west, grassland desert in the north and forest swamp in the south, so it is also located in the middle of the earth, hence the name Hanzhong, which means the source of Hanshui River and the center of the earth. So Hanzhong's alias is also called Tianhan.

The history of Hanzhong, like the Hanshui River, goes from the misty distance, from the end of the mountain, through the mountains and rivers of Hanzhong, and through the Millennium.

As early as the Spring and Autumn Period and the Warring States Period, Hanzhong was the place where Qin and Chu fought for each other. When Qin Huiwen became king, the State of Qin defeated the State of Chu, and the State of Chu wanted to make peace, so Qin "took more than 600 Li of land and set it in Hanzhong County". The name "Hanzhong" was recorded for the first time in history.