These three counties have history.
There are two rivers in northern Shaanxi, and the army has three sides.
Two Sichuan refers to our Yanchuan and Yichuan, both of which have been literati since ancient times and belong to Yan 'an City.
The trilateral area was once the "frontier" of northern Shaanxi. There were many wars in ancient times, so there were many military commanders.
Now there are only two counties, Dingbian and Jingbian, which belong to Yulin City. Anbian County retired from the county to Anbian Town, and the area was merged into Dingbian County. ? So Anbian County ceased to exist.
As for the trilateral in the TV series "Shanbei Man", of course, it refers to the trilateral scope in the original work.
Extended data
Trilateral, a Chinese word, pronounced [sān biān]. In ancient times, it was usually a general term for three different regions, which had different meanings in different dynasties, generally referring to borders and frontiers. Now it also means "three aspects".
definition
1. Trilateral: Youzhou, Bingzhou and Liangzhou were called Trilateral in ancient times, later referred to as Frontier.
2. Trilateral: It now refers to Dingbian, Anbian and Jingbian in northern Shaanxi. Three counties are bordered by three sides (Anbian County retreats to Anbian Town, and the area is merged into Dingbian County).
3. Chinese refers to Xiongnu, South Vietnam and Korea.
It refers to the eastern, western and northern borders.
5. Ming refers to Yansui, Gansu and Ningxia.
6. The original Anbian, Dingbian and Jingbian counties were collectively referred to. During the period of War of Resistance against Japanese Aggression, it was the administrative division of the Shaanxi-Gansu-Ningxia Border Region, referred to as Trilateral.
7. Generally refers to the border, frontier.
References:
Trilateral-Baidu encyclopedia