Bacia hidrográfica do Mar do Norte e do Mar Báltico

This is where it is decided whether the water goes into the North Sea or the Baltic Sea

The Central European North Sea-Baltic Sea watershed begins at the North Sea-North Sea-Baltic Sea watershed near Lake Skarddørssjøan on the border between Norway and Sweden and ends at the North Sea-Baltic Sea-Black Sea watershed at the Kłodzko Snębie Mountain.
Here, at this point, it runs through the Müritz National Park in Mecklenburg.

Interesting coincidence discovery 😍