Where did the ancient Hetao area refer to?

Refers to the section of the Yellow River from Hengcheng, Ningxia to Fugu, Shaanxi. In the past, it also referred to the area surrounded by this section of the Yellow River; now it refers to the area between this section of the Yellow River and Helan Mountain, Langshan Mountain, and Daqing Mountain

The Hetao, located north of the 37th parallel, generally refers to The land east of Helan Mountain, west of Luliang Mountain, south of Yinshan Mountain, and north of the Great Wall. Including the Yinchuan Plain (Ningxia Plain) and parts of the Ordos Plateau and Loess Plateau, which today belong to Ningxia, Inner Mongolia, and Shaanxi. The Yellow River here first flows north along the Helan Mountains, then eastward due to the blockage of the Yinshan Mountains, and then southward along the Luliang Mountains, forming a "ji" shape, so it is called "Hetao". The Hetao Plain is generally divided into the Yinchuan Plain between Qingtongxia and Shizuishan in Ningxia, also known as "Xitao", and the "Dongtao" part of Inner Mongolia. Sometimes "Hetao Plain" is used to refer only to Dongtao, alongside the Yinchuan Plain. Dongtao is divided into the Bayannaoer Plain between Bayangol and Xishanzui, also known as "Houtao", and the Tumochuan Plain (i.e. Chilechuan and Hohhot Plains) between Baotou, Hohhot and Lama Bay. The "front set". Sometimes the Hetao Plain is called the Hetao-Tumochuan Plain.

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Before the Zhou Dynasty, the Huns belonging to Beidi lived in Hetao. During the Spring and Autumn Period, King Zhao Wuling of the State of Zhao extended his territory to the Yinshan Mountains and established Yunzhong County, located in the eastern part of the Tumochuan Plain. After the Qin Dynasty unified the Central Plains, he sent Meng Tian to lead an army of 100,000 to drive the Xiongnu out of Hetao, and moved 30,000 households there to guard the border, establishing Yunzhong and Jiuyuan counties. At the end of the Qin Dynasty, all immigrants returned to the Central Plains, and the Xiongnu occupied Hetao.