The stadium has an ellipsoid shape, oriented from East to West, with a total length of 247 m. and a width of 59 m. Its main feature is its enclosed form, as well as the fact that its two long sides to the east and west, respectively, are coming to close like slings. On the west side there is the main entrance with the form of three arched corridors, while table-shaped spaces are located at the two sides of the entrance. Another entrance to the eastern sling allowed access to the arena and to the neighboring Theater.
Two elongated retaining walls in the north and south hold the slopes of the long sides from the outside and define the cavea with the stands, which were contructed in built-up stair-like levels. Perpendicular to the external side, arched openings were leading to auxiliary vaulted rooms, with entrance from the outer sides of the monument.
The cavea had stone seats, which were probably removed during the Early Christian period. The exact time of placement of the seats can not be precisely determined, as it is quite possible that in the first years of the theater’s operation the slopes were od natural earth and the seats were added in a later building phase of the monument.