The Women's 4x100m Freestyle Relay event at the 2007 Pan American Games took place at the Maria Lenk Aquatic Park in Rio de Janeiro, Brazil, with the final being swum on July 19.
Preliminaries
The heats was held on July 18.
References
Swimming at the 2007 Pan American Games – Women's 4 × 100 metre freestyle relay Wikipedia(Text) CC BY-SA