How does the environment enhance the story?'The Sun Also Rises'

This question is good. It's not something that I usually think about when I read Hemingway, but environment really is important in most or all of his novels.

The action of The Sun Also Rises takes place mostly, as I recall, in the densely urban setting of Paris, France. This city is certainly interesting to and enjoyed by the main character, Jake Barnes, but it also has its flaws. Jake's encounter with the "poule," which may mean something close to "prostitute" -- I think her name is Georgette -- emphasizes the sickness of modern, urban life. (A similar compounding of the ideas of sickness, sexual activity, and urban settings can be seen in other pieces by Hemingway, including "A Very Short Story.")

There are several other environments in the novel, however, including the natural setting of the fishing trip and the less developed village where the fiesta is held, both in Spain. If there is joy and peace in the novel, it's more likely to be found in these two places, not in Paris.