Water is a green ribbon. What does the next sentence mean?

Green mountains are like jade hairpin.

In the Tang Dynasty, Han Yu's poem "Water is a green belt and mountains are like jade hairpin" vividly summarizes the special colors of Guilin's landscape. Hosta is used to describe those steep and steep peaks that rise like a lotus, while Luo Qing is used to describe the winding, clear and green river that looks like a river.