Baslerweiher is actually artificially created. In the 19th century, the Kleinsee was created as a drinking water reservoir for the city of Basel, 20 kilometers away (and financed by the …
An inconspicuous puddle. But if you take a moment to look, you can see newts taking their breath and diving back down again and again. After a thunderstorm the water is a bit cloudy, but still sees something.