Zaghwan is a town in the northern half of Tunisia.
Situated on a low ridge of the Dorsale Mountains, the town has a mild climate and presents a green aspect. The town is famous for its roses, originally cultivated by Muslim refugees from Spain in the seventeenth century.
On the mountain south of the city is the Roman Water Temple Djebel Zaghouan, source of an aqueduct which used to take water to the city of Carthage over 100 km away.
Zagwan is the presumed site of the Ancient city of Zica, which was among the many of sufficient importance in the Roman province of Africa Proconsularis to become a suffragan diocese of the Metropolitan of Carthage, in the papal sway, yet was to fade completely, probably at the seventh century advent of Islam. Wikipedia