What does it mean to be among the blue and green water clouds?

This is "Send Off Zheng Ji Returns to Luoyang" written by Sikong Shu in the Tang Dynasty

Amidst the green and Chu-colored water and clouds, a drunken spring breeze sends you back. Where is the most enviable hometown? Runan saw Luoyang Mountain for the first time.

The scenery of Chuse Chudi.

Shuiyunyun. Mostly refers to the scene where water and clouds meet.

This is a farewell poem. The author uses the vast mountains and rivers of Chuland to express his emotions, express his best wishes to his friends, and at the same time arouse nostalgia.