Saint-Pierre-des-Nids (French pronunciation: [sɛ̃ pjɛʁ de ni]) is a commune in the Mayenne department in north-western France.

[3] The Commune along with another 11 communes shares part of a 5,255 hectare, Natura 2000 conservation area, called the Vallée du Sarthon et affluents.

[4] In addition the Commune along with another 4 communes shares part of a 1,190 hectare, Natura 2000 conservation area, called the Alpes Mancelles.

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