The Marble Arch, also Arch of the Philaeni (Italian: Arco dei Fileni), formerly known in Libya as El Gaus (i.e. "The Arch"), was a monument in Libya built during the days of Italian colonization. The arch marked the border between Tripolitania and Cyrenaica, and was located on the actual Libyan Coastal Highway (at that time Via Balbia) near Ra's Lanuf. It was designed by architect Florestano Di Fausto in response to a request by the Italian Governor-General Italo Balbo.