Poetry Xiaozhu will give you the answer:
"Crossing the Water Ridge" by Wen Tingyun of the Tang Dynasty
The ruthless stream seems to be affectionate, and it takes three days to walk in the mountains.
Lingtou is the place where we part ways, the sound of farewell is heard all night long.
Translation: The stream is ruthless, but during the three days I have been in the mountain, the stream has been walking by my side as if on purpose. Therefore, when we reach the top of the ridge and walk separately from the stream, we can't help but feel a sense of farewell.
"Crossing the Watershed" is a popular seven-character quatrain written by Wen Tingyun, a poet in the Tang Dynasty. This poem is about the author's relationship with the stream and his feelings when crossing a watershed.