If there are few stars on the moon, blackbirds will fly to the south.
Adjectives+locative words plus dynamic scenery such as running water and wind that often appear in poems.
For example, the small building was easterly again last night, and the old country was unbearable to look back at the middle of the month.
After many trials and tribulations, it is still strong, and there are winds in the east, west, north and south. Zheng Xie
Wanshui Qian Shan flows eastward to Li Bai.