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RE: Weekend trip - Helgeroa, Langesund, Porsgrunn
Swimming prohibited. There is this place, though: https://www.tripadvisor.com/Attraction_Review-g274772-d3609845-Reviews-Zakrzowek-Krakow_Lesser_Poland_Province_Southern_Poland.html
An artificial lake with no inflow or outflow. Surprisingly clean! Most likely because it's alkaline from the limestone.