https://www.myswitzerland.com/de-ch/erlebnisse/der-faelensee-faszinierender-alpstein-fjord/

Fälensee is a hidden gem in the Alpstein region of Switzerland, accessible only by a picturesque hike. It's located right next to the Bollenwees Hütte (See seperate pinpoint). It is truly beautiful and in my opinion looks like a Fjord!

But beware: Even if you see people swimming in the lake, my local friends told me that you shouldn't really because they used to let all the grey water + toilet water from the hut in the lake. They removed most of it but still – better be safe :)