Fun fact this is actually the Rhine river that runs sort of ⅔ of the way through Düsseldorf, similar to the Thames in London or the Seine in Paris.
The other bank is much more residential and a little high end so it’s not really a gathering place for the population, whereas the bank shown in the picture is 2 blocks from a tram line that runs parallel to the river and runs into the heart of the CBD making it an extremely approachable body of water and pedestrian strip.
On the weekends, the city holds public events to draw people to gather on this bank like food fares, carnivals, concerts. It’s always packed on the weekends and generates a shit ton of foot traffic for all the pubs and restaurants in adjacent streets.
I had no idea all this was covered in highways just a few decades ago, making the city more walkable was an amazing choice. If you’ve never been to Düsseldorf before or don’t know anything about it, it is definitely one of the highlights of Germany once you’ve had your fill of all the war sites. Extremely liveable city without feeling overcrowded, and just a stones throw from the Netherlands, Belgium, Luxembourg, and France.