One thing interesting about the setting in the short story "Through the Tunnel" is that author Doris Lessing carefully uses word choices to show the striking contrast between the beach and the enticing rocky bay, and the contrast helps set the mood of the story and develop the major theme.
Segregation was described as wilderness as a way of indicating the inhumaneness of this treatment, for literally wilderness indicates a place without civilization or society.
Injustice is not always a wilderness, although it sometimes can be. Injustice acts within established society all the time -- sometimes, de jury, it can be under the guise of a law-abiding action, but in reality (de facto) it could be injustice. For example, Donald's Trump urge to deport and restrict immigrants from certain countries reflects injustice in an established environment (in my opinion, of course).
Here are a few reasons why urban is better. 1. It is closer to places such as hospitals, stores, and gas stations. 2. You are closer to other people and there are more opportunities for socializing. 3. If there is an emergency the police and paramedics can get to you faster. Good luck on the assignment!
It helps the bird to reach food in hard to get to places.