Except itís not really white, unless itís 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. Itís about 1.5 square km, which is less than a square mile, so thereís 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, GraubŁnden (or Grisons) connects the locals with Italy. At least it does in summer. Itís 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.