Recent archaeological research in agricultural areas in western Germany has identified the remains of an artificial canal from the Roman period, generally dating from the 1st to the 4th century CE. Initially, researchers were drawn to an unusually simple, unnatural structure resembling an ancient riverbed, hidden beneath the surface. Only the application of geophysical methods such as gradient magnetometry, electrical resistivity tomography, and sediment core analysis allowed them to clearly establish that this was a fully artificial canal, not a natural branch of the Rhine.