Cisterne Romane

Beneath Fermo's hilltop streets lies a Roman water reservoir of thirty barrel-vaulted chambers arranged in three parallel rows. Built in the Augustan age to collect and distribute water for Firmum, the cisterns preserve an extensive example of Roman hydraulic engineering.

Why it matters

The Cisterne Romane were built between the late first century BCE and the first century CE to collect rainwater from the hill and supply the city. The thirty chambers cover about 2,200 square metres and had a maximum capacity of roughly 15,000 cubic metres. Their walls are coated with opus signinum, a waterproof mortar that helped preserve the complex.

What to notice

The chambers are arranged in parallel rows beneath barrel vaults, with brick piers and low openings connecting the spaces. The reddish waterproof plaster, made with crushed terracotta, coats the walls and floors. The reservoir formed part of a wider system of three tanks at different elevations: one near the Girfalco is now buried, while the smaller Piccole Cisterne lie near Largo Temistocle Calzecchi Onesti. The system combined storage with water purification. Charcoal inscriptions left by people sheltering from air raids during the Second World War record a later use of the underground chambers.

Context and history

The Roman reservoir gathered rainwater from the hill and distributed it through Firmum. After antiquity, the chambers returned to public use in the late nineteenth century as part of Fermo's aqueduct system; some continued to carry water into the 1980s. That long afterlife added aqueduct fittings and other traces to the Roman structure. The site is now part of the city's civic museum network.