Immediately to the South and West of the Baths II building you have a large stone paved square (figs. 1-2), through which the hot and cold water canals feeding the Baths flow. 

Fig. 1 - The square to the South of the Baths complex highlighted in green  (from Bacco, Serra 1998; re-worked by C. Tronchetti).

Fig. 2 - The square paving (photo by Unicity S.p.A.)

On the southern side, a long, wide staircase goes to the ground's upper level (fig. 3), where the current habitat stands and where the remains of the ancient one were found.

Fig. 3 - The square and stairs leading to the habitat (photo by Unicity S.p.A.)

On its west side the square narrows; in this point too you have steps going down towards the the river below (fig. 4).

Fig. 4 - Western sector of the square, with a short flight of steps going towards the level of the Tirso river (photo by Unicity S.p.A.)

In the southern part, where the ground tends to climb, you have a strong containment wall (fig. 5) next to the steps and, further up, water cisterns (fig. 6).

Fig. 5 - The wall closing the square on the southern side (photo by Unicity S.p.A.)

Fig. 6 - Large cistern above the square (photo by Unicity S.p.A.)

Considering the size and care taken over how the square was built, it is assumed to be the forum, the main square, of the Roman town.