Le lac de Sewen est un lac-tourbière situé dans le Haut-Rhin sur la commune de Sewen, tout près du Ballon d'Alsace. C'est le seul lac glaciaire de vallon en Alsace, il est classé grand site national depuis 1982. La tourbière est une zone protégée avec un fond très marécageux,. Il habrite une population de castors européens, une espèce protégée en France.
Source: Wikipedia.org
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Source: Chatiran
Copyright: Creative Commons CC BY-SA 4.0
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