Lake Cadagno, Quinto, Piora valley, Ticino, Switzerland
Lake Cadagno is a meromictic lake in the Piora valley, Switzerland near Lago di Ritom.
Check these articles to explore the region - http://www.familyearthtrek.com/2018/02/19/a-child-friendly-hike-to-the-three-mountain-lakes-ritom-tom-and-cadagno-switzerland/
https://www.myswitzerland.com/en-in/experiences/summer-autumn/summervacations/stories/the-mysterious-lago-cadagno/