Which of the following is considered to be the cleanest river in the world?
Correct answer: Verzasca

PC
I picked the river I hadn't heard of as the likely clean one!

Sassy Pants
Switzerland is one of cleanest country in the world.

Dayrell
Thank you QuizzLand for the gift of this point of information I never knew this AT ALL!! Makes a whole lot of sense whereas the Swiss Alps have that pristine location

TestyAlien3443
PC, similarly, I avoided the big rivers that have cities along them

barb
PC, I did the exact same thing! The others I've heard of more often, so that was an indicator to me, NOT to pick any of them! LOL!

BrainTek
they end it with insidious - setting it up for the next region and story in the insidious series of movies

Eva
TestyAlien3443, me too

TestyAlien3443
PC, 30km isn't much of a river. My commute to work is longer than that.

Tom
this seems strange, Europe has a lot of industry.
I would have thought it would be in: Tasmania Australia, NZ South Island, southern South America or Iceland/Greenland.