Comment by tsbinz

You probably saw it in person as well, it's called a river :) In Zurich there's multiple places where you can swim in the Limmat, and it takes quite some effort to stay in place - one example is https://images.app.goo.gl/qTASdR51yDTiCk299 (of course you could go without the installation but this allows people to use it that would be afraid of getting carried away ...)