"Fossa Eugeniana" on the Prinzenstraße

"The Fossa Eugeniana is an unfinished canal between the Rhine and the Meuse. Construction began in 1626, the remains that are still visible are preserved by the monument protection agency. Its width is about 4.3 m (as far as can be determined), its length is almost 50 km."
"The course of the Fossa Eugeniana:
The canal begins or ends at Rheinberg in the Rhine (♁⊙), from there it runs north of Kamp-Lintfort, past the Kamp monastery between Sevelen and Issum towards Geldern. It then leads south past Walbeck (where it still carries water and is called Grift), where the canal then bends towards the south between Arcen (Netherlands) and Straelen. It flows into the Maas near Venlo (♁⊙)

Large parts of the course of the Fossa Eugeniana are still clearly visible today. Some of the jumps are still visible, especially on the section between Geldern and Rheinberg. The complex therefore represents an important archaeological monument between Germany and the Netherlands.

At the end of the 1990s, an approximately 60 km long cross-border path for hikers, cyclists and skaters was set up along the Fossa Eugeniana, which also leads past other sights in the area.

Source: de.wikipedia.org/wiki/Fossa_Eugeniana