Winter memory: quarry in Głuszyca looks like a typical mountain lake - surrounded by sharp and rapid rocks of Suche Mountains. The lake is 300m long and very deep. In winter there are few frozen icefalls.
here you can see it on map:
https://mapy.cz/turisticka?moje&x=16.3551785&y=50.6650585&z=17&source=osm&id=109603728