Boyle's Thirty Acres was a large wooden bowl arena in Jersey City, New Jersey. It was built specifically for the world heavyweight championship bout between Jack Dempsey of the United States and Georges Carpentier of France on July 2, 1921. It held approximately 80,000 fans and was built at a cost of $250,000. It was situated around Montgomery Street and Cornelison Avenue, on a plot of marshland owned by John P.