Guanzhong refers to the "four passes", namely Tongguan in the east (Hangu Pass), Sanguan in the west (Great Earthquake Pass), Wuguan in the south (Languan) and Xiaoguan in the north (Jinsuo Pass). Now Guanzhong area is located in the middle of Shaanxi Province, including five cities and one district of Xi 'an, Baoji, Xianyang, Weinan, Tongchuan and Yangling.
the Weihe plain includes Xi' an, Baoji, Xianyang, Weinan and other cities in Shaanxi province, Yuncheng and Linfen in Shanxi province, with a total of six cities in Qin Jin province, which is also included in the national "Guanzhong Plain Urban Agglomeration".
Because the Weihe River originates from Niaoshu Mountain in Weiyuan County, Dingxi City, Gansu Province, flows into Shaanxi Province from Baoji, and flows through Baoji, Xianyang, Xi 'an and Weinan from west to east, it is called "Weihe Plain" and "Guanzhong Plain" in Shaanxi Province and "Guanzhong Basin" in China.
Guanzhong Plain is located between Weibei Mountain (Laolongshan Mountain, Yie Mountain, Yaowang Mountain, Huanglong Mountain, Liangshan Mountain, etc.) and Qinling Mountains. This area is very vast, so it is also called "Land of Abundance".
Extended information:
"Because Guanzhong was not a formal local administrative division at first, there are many explanations. According to the Biography of Historical Records of Huo Zhi, Guanzhong is a river and a river from the east to the east.
Wei means Wei water (the author should say' drowning means drowning'), Yong means Yongshan, the river means Yellow River, and Hua means Huashan. However, Hanzhong and northern Shaanxi are sometimes included in the scope of Guanzhong in Historical Records. Later, there were some statements, which were mostly related to arguments.
It is between Hangu Pass, Dasanguan Pass, Wuguan Pass and Xiaoguan Pass. One is between Hanguguan and Longguan; One said it was between Hangu Pass and Sanguan Pass. There are other sayings. Although these statements came out late, they have roughly the same meaning as the so-called four blockades in the Warring States, Qin and Han Dynasties, which is quite in line with the situation at that time. "
Baidu Encyclopedia-Guanzhong