Except it’s not really white, unless it’s frozen and snow covered. And given that it is 2234m above sea level (over 7000ft) that happens quite frequently.
If you happen to be staying in the Bernina area of Switzerland, you might want to travel along the Bernina Pass and take a look at this little lake. It’s about 1.5 square km, which is less than a square mile, so there’s not masses of walking to get round it, but expect to do some clambering.
The pass, which is located in the eastern end of the country, Graubünden (or Grisons) connects the locals with Italy. At least it does in summer. It’s pretty much closed from October to April. Check local reports before setting off!The lake is at least partially dammed, and has a hydro-electric power station at one end, providing clean electricity to the national grid.