The Rectangle

From the text:

The Rectangle was the most notorious district in Raymond. It was on the territory close by the railroad shops and the packing houses. The great slum and tenement district of Raymond congested its worst and most wretched elements about the Rectangle. This was a barren field used in the summer by circus companies and wandering showmen. It was shut in by rows of saloons, gambling hells and cheap, dirty boarding and lodging houses.