Lake Oeschinen, Switzerland 

The lake was created by a giant landslide and is fed through a series of mountain creeks and drains underground

 https://t.co/wE6h0v5Nor https://video.twimg.com/ext_tw_video/1845059288357629968/pu/vid/avc1/720x1280/NEcEP6I30hg4MYLs.mp4?tag=12