Trollsjön is a beautiful (and very cold since the streams you see in the background are meltwater) alpine lake. It lies in northern Sweden close to the border of Norway. It's incredibly clear and is thought to be Sweden's cleanest lake. The lake is 34 meters (110 feet) deep and you can see all the way down to the bottom! This picture captures the hesitation of this guy, getting the courage to jump into the ice-cold water.