The lake is of particular interest to border enthusiasts for 2 reasons, firstly the border between Andorra and France goes through it and secondly, newly designed and erected border markers (the first and only ones on the Andorran border) mark the new border. In 2012 an agreement was reached which reconciled the disagreement about where the border was. The lake was divided in 2 and 6 new border markers (the first on any Andorran border) were erected. Maps, photos and more details in my report here