Castra Batava, Roman military fort at the confluence of Danube and Inn rivers, Germany.
Castra Batava was a Roman military fort built on the site of present-day Passau in Bavaria, at the point where the Inn river flows into the Danube. The fort had a rectangular stone layout with barracks, administrative buildings, and defensive walls that controlled the river crossing.
The fort was established in the 2nd century as Rome worked to reinforce its frontier along the Danube. Over time, a civilian settlement grew around it, forming the foundation of what would later become the city of Passau.
The name Castra Batava comes from the Batavian cohort, a unit originally from the Rhine delta region of what is now the Netherlands. The modern city of Passau still carries traces of this Roman past in its layout and in local museum collections.
The remains of the fort lie within the city center of Passau, where some traces are visible in local museums and at a few above-ground spots. Visiting the city museum of Passau is a good way to see finds from the site in a sheltered setting.
Directly across the Danube stood a second fort called Boiodurum, now associated with the Innstadt area on the opposite bank. The two forts worked together to watch the river crossing from both sides at once.
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