The video shows UK parkour athlete Toby Segar taking a running jump before clearing a wall, a set of stairs and a waterfront footpath before landing in the river.
The commentary from onlookers is succinct. One man can be heard saying: “What the f***?”
Jumping at the location where Segar took off is not illegal, a police spokesperson told Swiss news site 20 Minuten.
But the spokesperson added that swimming is not recommended at the spot in question because there are obstacles in the water and there is no clear exit point.
He urged people not to try and imitate Segar's leap.
Toby Segar is known for being a finalist on the Ninja Warrior UK game show.