What does the cold autumn in the north of Xiangjiang River in Orange Island mean?

The words "Orange Island, Xiangjiang River to the north, independent cold autumn" illustrate the time and place. Specifically, Cold Autumn is about time, referring to the late autumn season; "Orange Island" explains the location and refers to a certain location in Orange Island; Xiang Jiang Bei Qu describes the environment, indicating that the author is located on the north bank of Xiang Jiang.