The canal, though its creation was closely tied to the military operations of Gaius Marius, has shown signs of being used beyond its initial military purpose. The stone platforms found south of the structure, as well as commercial pottery and its prolonged use, suggest that the canal was integrated into the port system of Arles, serving as a passage for goods from the Mediterranean to the interior of Gaul. In later centuries, especially during the High Roman Empire, the canal was likely part of the port system known as Fossae Marianae, a set of port facilities documented in Roman itineraries and ancient maps. Its presence was crucial in establishing the link between the city of Arles – which became a Roman colony in 46 BC – and maritime trade, which favored its economic growth and consolidated its role as an important logistical hub.
Source: tatoeba (13113715)