This beauty of a lake is situated in the canton of Valais in Switzerland. Namely in the Binntal, a valley famous for its mineral wealth and therefore a magnet for rock crystal prospectors.
Accessible only on foot you'll reach the Mässersee after an approximate 2 hours hike. A little steep sometimes but fully worth the effort!
"You only live once, but if you do it right, once is enough."
– Mae West