Duboce Triangle is the smallest neighborhood in San Francisco. The neighborhood is only a few square blocks made up of mostly what doesn't belong to the surrounding neighborhoods of Lower Haight, The Castro, and The Mission district.
The exact borders of Duboce Triangle are a little fuzzy, Market Street is the southern border and Castro Street marks the western edge, but some consider Duboce Avenue to be the north end, while the neighborhood association includes Duboce Park and the alleys which open into it by extending the border to Waller Street.