There are dark snow-capped mountains in Qinghai, and the lonely city looks at Yumenguan. At the beginning, the poet painted a magnificent and desolate frontier fortress scenery, which summarized the face of the northwest frontier fortress. The sky on Lake Qinghai is covered by long clouds, and the snow-capped mountains in Hubei are faintly visible. Over the snow-capped mountains, it is an isolated city in the desert of Hexi Corridor, and further west, you can see Yumen Pass. In the Tang Dynasty, there were Tubo in the west and Turkic in the north. At that time, Qinghai was the place where Tang Jun and Tubo fought many times, and outside Yumenguan was the sphere of influence of the Turks, so these two cities were important frontier cities in the Tang Dynasty.

There are dark snow-capped mountains in Qinghai, and the lonely city looks at Yumenguan. At the beginning, the poet painted a magnificent and desolate frontier fortress scenery, which summarized the face of the northwest frontier fortress. The sky on Lake Qinghai is covered by long clouds, and the snow-capped mountains in Hubei are faintly visible. Over the snow-capped mountains, it is an isolated city in the desert of Hexi Corridor, and further west, you can see Yumen Pass. In the Tang Dynasty, there were Tubo in the west and Turkic in the north. At that time, Qinghai was the place where Tang Jun and Tubo fought many times, and outside Yumenguan was the sphere of influence of the Turks, so these two cities were important frontier cities in the Tang Dynasty.