The natural venue for an event of this scale would, of course, be Colosseum itself. Details are a bit sketchy, but Romans did apparently try to turn the gladiatorial ring into waterworld at least once. read more
they filled the colosseum with water by the pipes that they placed between the brickwork when building the colosseum this enabled them to fill and unfill the colosseum for their performances and re enactments. read more
Imagine trying to fill this thing up with water. (Image: Public Domain/WikiCommons) Augustus threw a naumachia in 2 BC involving a basin broad enough to hold 30 ships representing Persian and Athenian fleets. read more