Where did Hexi occupied by Qin during the Warring States refer to?

The land in the west during the Qin and Wei Dynasties, the area between Luohe and the Yellow River in the east of Guanzhong, Shaanxi (the area west of the south section of the Yellow River between Shanxi and Shaanxi)

Hexi, also known as Hexi Corridor, is located in the west of Gansu. It starts from Wushaoling in the east, borders Xinjiang in the west and the desert in the north. A narrow strip with a length of 1000 km from east to west and a width of only 40 ~1000 km from north to south. Including Jiuquan, Zhangye, Wuwei, Jinchang and Jiayuguan, as well as Yongchang, Jinchuan, Jiuquan, Yumen, Jinta, Anxi, Dunhuang, Subei, Aksai, Zhangye, Shandan, Minle, Linze, Gao Tai, Sunan, Tianzhu, Minqin, Gulang and Wuwei 19 counties and cities.