A number of Roman ports were known as portus magnus ("grand port") :
- Portus Magnus, Spain: modern Almería
- Portus Magnus, Algeria: modern Bethioua
- Portus Magnus, Egypt: modern Alexandria
- Portus Magnus (Mauretania), in the Roman province of Mauretania Caesariensis
- Magnus Portus: modern Bosham, near Chichester, England
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