The tract adjoining this long line of lagoons is, like the basin of the Po, a broad expanse of perfectly level alluvial plain, extending from the Adige eastwards to the Carnic Alps, where they approach close to the Adriatic between Aquileia and Trieste, and northwards to the foot of the great chain, which here sweeps round in a semicircle from the neighborhood of Vicenza to that of Aquileia.
Cremona, on the north bank of the P0, was an important meeting point of roads and Hostilia (Ostiglia) another; so also was Patavium, farther east, and Altinum and Aquileia farther east still.
As to the roads leading out of Italy, from Aquileia roads diverged northward into Raetia, eastward to Noricum and Pannonia, and southwards to the Istrian and Dalmatian coasts.
He went himself to the wars with Verus in 167, first to Aquileia and then on into Pannonia and Noricum, wintering at Sirmium in Pannonia.
The old castle, at one time the residence of the patriarchs of Aquileia, and now used as a prison, was erected by Giovanni Fontana in 1517 in place of the older one destroyed by an earthquake in 1511.