This is something you don’t see everyday. High on a hill overlooking the Swiss countryside is a little pool of water, surrounded by cattails:
You can’t see it very well, but if you look in the middle and far down the hill you’ll see the Thur River.
In fact, and although I don’t show it, just behind me is a substantially higher set of hills. So as the groundwater slowly heads towards the Thur it takes a little break in this natural pond.