What is the name of the northeast mountain range of Lotus Wuying Longcheng in Qin 'an County?

Qin 'an County is located in the southeast of Gansu Province, north of Tianshui City and downstream of Hulu River, a tributary of Weihe River.

It belongs to the Liang Mao gully region in the west of the Loess Plateau in central Gansu, with many mountains and few rivers, undulating Liang Mao and criss-crossing gullies. It is one of the 18 dry counties in the whole province and one of the key counties for national poverty alleviation and development. The county is about 65 kilometers long from east to west and 50 kilometers wide from north to south. The terrain is high in the northwest and low in the southeast.