Aquis Querquennis is a Roman fort in Ourense Province, Galicia. It was constructed circa 69-79 AD to house soldiers building the Via XVIII and was occupied by the Legio VII Gemina until that unit was posted to Dacia in 120 AD and the fort abandoned. The fort was rediscovered in the 1920s and some excavations carried out by local archaeologist Florentino López Cuevillas. In 1949 the site was flooded by construction of the As Conchas reservoir. Since 1975 excavations have been carried out on the fort during periods when the reservoir level falls.