Is 647.740 chains as long as The Belmont Stakes?
It's about five-and-a-half times as long as The Belmont Stakes
The length of The Belmont Stakes is about 120 chains.
(Belmont Park, Elmont, New York) (total race length)
The total race length of the Belmont Stakes run at Belmont Park is 120 chains. It was during the 1974 Belmont Stakes that Secretariat set an America Grade 1 stakes record in winning by a distance of about 3.7575760 chains
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