Flathead Lake, The Clearest Water On Earth
Lots of smaller mountain lakes that are super clear. I’m sure In Europe it’s the same why. Places where you have to hike in are usually cleaner. Flathead is amazing though. You drive right to it and there is cherry farms all around it. Houses. It’s stupid expensive to live there. People all over it which makes it amazing that it stays so clear. It is natural though not like a reservoir which tend to get a lot of sediment.