The Romans penetrated into the land they call Germania as far as the Rhineland and the Danube region. They set up three provinces on the territory of present-day Germany. But how do the Romans manage to secure these provinces against attackers from free Germania for centuries? In addition to the 550-kilometer-long border wall, the Limes, it is the rivers Rhine and Danube that offer protection as a “wet border”. But only if they are well guarded. For example with fast patrol boats.
