Château-Gontier-sur-Mayenne (French pronunciation: [ʃɑto ɡɔ̃tje syʁ majɛn]) is a commune in the Mayenne department in north-western France.

[3] It was established on 1 January 2019 by merger of the former communes of Château-Gontier (the seat), Azé and Saint-Fort.

[4]

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