Portus

Portus
	The mouth of the Tiber, with the hexagonal harbour of Portus at upper middle (modern day "Lago Traiano").
	Click on the map to see marker
Region	Lazio
Coordinates	41°46′44″N 12°15′32″E / 41.779°N 12.259°E
Type	Settlement, Port
History
Periods	Roman Republic; Roman Empire
Cultures	Ancient Rome
Site notes
Excavation dates	yes
Archaeologists	Guido Calza; Simon Keay
Public access	Yes

Portus was a large artificial harbour of Ancient Rome located at the mouth of the Tiber on the Tyrrhenian Sea. It was established by Claudius and enlarged by Trajan to supplement the nearby port of Ostia.^[1]

The archaeological remains of Portus are near the modern-day village of Porto within the comune of Fiumicino, Lazio, just southwest of Rome.^[2]