Hi and welcome to the site. The picture above is Slåen Sø; one of the cleanest lakes in Denmark. The reason why Slåen Sø has such pure waters is that there is no influx to the lake from cultivated or populated areas. At the south side of the lake a spring provides water. There are also underwater springs. In the summertime we go there. It’s a nice place to relax or take a swim.