Starting with two racetracks in New York (Saratoga and Belmont) a review of how furlongs translate to the actual configuration of each track.
Track and field - Wikipedia
Racecourses of Great Britain and Ireland - National Horseracing Museum
Which race track has the longest straight? - Quora
Wolverhampton Course Guide
How so many things in U.S. racing seem designed to harm the horse, Topics: Tapeta
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Sandown Racecourse Course Map
What's A Furlong - The Standard Unit of Measure in Racing
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Furlong - Wikipedia