🇮🇹 Italy · Submerged site
Portus Claudius & Trajan's Hexagon – Imperial Harbour Basins of Claudius and Trajan
Roman Imperial (42–64 Claudian, 103–113 Trajan) · Roman Claudian/Trajanic
Rome's 234-ha Claudian outer moles and 32-ha Trajan hexagonal inner basin — outer moles now lagoonal –1 to –2 m in Maccarese wetland.