Ostia was a harbor city situated at the mouth of the river Tiber, some 18 miles (30 km) to the west of Rome. It was founded by Ancus Marcius, the legendary fourth king of Rome, around 620 BC. The settlement is supposed to have aimed three goals: to give ancient Rome an outlet to the sea, to ensure its supply of wheat and salt, and finally, to prevent an enemy fleet to ascend the Tiber.
“Ancus Marcius built a city at the mouth of the Tiber, and settled it with colonists,” Marcus Tullius Cicero wrote in De Re Publica (II, 18, 33).
Archaeologists have unearthed many ancient buildings and main roads in Ostia, but the location of the river harbor remained unknown.
If you search on “ostia” here there are a couple of other items on it, including the finding of a portion of a ship. The photo there only shows to core locations, I wonder if that’s all they did? Seems like a lot from only two cores. I also am interested in the bowl shape outlined in the aerial. I had immediately thought that it outlined the harbor area, but I suppose it didn’t have to be that large, and the only borings are much closer to the water. Pretty cool though.
RELATED (sorta): Roman road uncovered in York