What is the setting in the story, The Ones Who Walk Away from Omelas?

The story is set in the utopian village of Omelas. In the early descriptions of the story, Omelas seems like a place of perfection: the buildings are beautiful, the topography is idyllic, and the people are content. However, as the narrative progresses it becomes clear that Omelas is not perfect and that there are some very sad, disturbing things happening within this society.