Flottenkastell Alteburg, Roman naval fortress in Marienburg, Germany.
Flottenkastell Alteburg was a Roman military base that stretched across several hectares along the Rhine, containing barracks, workshops, and fortifications for managing a fleet. The site has been excavated systematically and reveals the remains of buildings made from mudbrick and later stone, which were necessary for operating merchant ships and military galleys.
The fortress was founded around 50 AD to house and control the Roman fleet on the Rhine. It gradually lost importance and was abandoned in the second half of the 3rd century as Roman military presence on the river changed.
The site shows how the Roman military managed and maintained their fleet operations along the Rhine. Visitors can observe how closely the daily lives of soldiers and personnel connected to the river and their vessels.
The remains are partly overgrown today and require careful attention to identify the structures properly. It is recommended to stay on marked paths and use the information panels on site that explain the layout of the ancient buildings.
The base contained specialized docks and workshops where Romans built and repaired their ships in a river setting far from seaports. This makes the site a rare example of Roman shipbuilding facilities located inland.
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