Question: Greenwood Heights, Brooklyn is bordered to the west by a canal that is how long?
Sentence (from "Greenwood Heights, Brooklyn"): The much-debated borders are, roughly, the Prospect Expressway to the north, Gowanus Canal to the west, Eighth Avenue to the east, and 39th Street to the south (southern boundary of the Green-Wood Cemetery and northern boundary of the 36th-38th Street Yard and South Brooklyn Railway).
Relevant evidence: Yes