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The natural vegetation in the Sous is savanna dominated by the Argan (Argania spinosa), a local endemic tree found nowhere else; part of the area is now a UNESCO Biosphere Reserve to protect this unique habitat.
Pimachiowin Aki (which means Land that gives life in Ojibwe, ᐱᒪᒋᐅᐃᐧᓂᐊᑭ) is a large proposed UNESCO biosphere reserve and World Heritage Site located in the Boreal Forest that covers parts of Manitoba and Ontario.