The small fort at Nigrum Pullum (‘black chicken’ or ‘black soil’) controlled the confluence of the little river Meije and the Rhine, the frontier river of the Roman province of Germania Inferior. The military settlement was founded after 47, when the Roman general Gnaeus Domitius Corbulo reorganized the frontier zone. It was rebuilt several times and the foundations of the HQs are still visible. The greatest discovery, however, had little to do with the army: six ships. I used to have two pages on Zwammerdam, which I have now joined and to which I have added photos of models of the ships. You can find it here and your satellite photo is here.
Castellum Nigrum Pullum (Zwammerdam)