naumachy

Etymology
From and its source,.

Noun

 * 1)  A place built to stage a mock sea-battle, or the show performed therein.
 * , II.2.4:
 * Lacedæmonians held their public banquets […], plays, naumachies, places for sea-fights, theatres, amphitheatres able to contain 70,000 men, wherein they had several delightsome shows to exhilarate the people […].