Which place does the "ancient post" in the poem "The ancient post's depression is left here" by Cui Tong, a poet of the Ming Dynasty, refer to?

The poem "The depression of the ancient post is traced here" comes from the poet Cui Tong's "Dongzhou Collection" in "Long to Stay at Changde Dalong Post Yang Sui Weng Yun". The full poem is as follows: The bananas are yellow, the osmanthus has fallen, and the vines are withered. The depression of the ancient post is traced here. At the end of the year, he still rides on the ban horse, and sings for a long time, which is really shameful for the dragon lying in the hut. A night's journey has been covered with snow, and I have returned home after thousands of miles. When I get up in the morning, it is a joy to meet the Yang Zhi Festival. I bow to the five heavy clouds in my clothes from a distance.

It is not difficult to see from the title of this poem that this is a poem written by the poet to miss his relatives and friends when he stayed at Dalongyi in Changde. The Changde Dalong Station mentioned in the title of the poem is today's Dalongzhan Town, Dingcheng District, Changde City, Hunan Province. It was a relatively famous local station during the Ming and Qing Dynasties.