A number of Roman ports were known as portus magnus ():
Portus Magnus, Spain: modern Portmán Portus Magnus, Spain: modern Almería Portus Magnus, Algeria: modern Bethioua Portus Magnus, Egypt: modern Alexandria Port Portus Magnus (Mauretania), in the Roman province of Mauretania Caesariensis Magnus Portus: modern Bosham, near Chichester, England
See also
Portus Augusti Portus Divinus Portus (disambiguation) Magnus (disambiguation)