Tell me the meaning of the phrase "The protection of Shuofang, the throat of the desert".

“The protection of Shuofang, the throat of the desert” refers to Helan Mountain.

Helan Mountain has an altitude of 2,000 to 3,000 meters. The main peak, Aobao Gelao, is located in the northwest of Yinchuan, with an altitude of 3,556 meters. It is the highest peak in Ningxia. The terrain on the west side of the mountain is gentle and submerges into the Alxa Plateau. The western slope of Helan Mountain is gentle and gradually transitions to the Inner Mongolia Plateau; the east side of the mountain is majestic and spectacular, with overlapping peaks and steep cliffs and valleys. Overlooking the Yellow River Hetao and the Ordos Plateau to the east, the majestic mountains and large height differences form a natural barrier, thereby weakening the Siberian high-pressure cold air flow, blocking the eastward invasion of the Tengger Desert, and preventing the westward advancement of the humid southeast monsoon. , becoming a natural barrier for the Yinchuan Plain.

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