Ercé-en-Lamée (French pronunciation: [ɛʁse ɑ̃ lame], literally Ercé in Lamée; Gallo: Erczaé, Breton: Herzieg-Mez) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.
The river Semnon forms all of the commune's northern border.
Inhabitants of Ercé-en-Lamée are called Ercéens in French.
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