The Old City of Beiting is the capital of the northern court of the Tang Dynasty, the capital of the northern court, the governing house of the northern court, the scale of which is the largest on the northern foot of the Tianshan Mountains and the second on the whole Xinjiang. After years of vicissitudes, although it has been transformed into The splendid ruins of the dead world can still be glimpsed into the magnificent weather of the city when it is heavy, and the majestic atmosphere of Takagaki. This millennium ancient city is also the seat of the important military and political institution of the Tang Dynasty, the Han Navy and the palace of Tingzhou. Its eternal sign is located in the county of Jimusar, Xinjiang Changji Hui Autonomous Prefecture, and it is only 12 kilometers south of the county. It is a national key cultural relic protection unit. From this text, it is impossible to know which aspect of the Beiting Old City?? ['Geographical location.', 'Cultural values.', 'City functions.', 'Demographic changes.']