Railway track

Château-Gontier (French pronunciation: [ʃɑto ɡɔ̃tje] ) is a former commune in the Mayenne department in north-western France. On 1 January 2019, it was merged into the new commune Château-Gontier-sur-Mayenne.

Château-Gontier-sur-Mayenne (French pronunciation: [ʃɑto ɡɔ̃tje syʁ majɛn]) is a commune in the Mayenne department in north-western France. It was established on 1 January 2019 by merger of the former communes of Château-Gontier (the seat), Azé and Saint-Fort.

The arrondissement of Château-Gontier is an arrondissement of France in the Mayenne department in the Pays de la Loire region. It has 76 communes. Its population is 73,211 (2021), and its area is 1,527.4 km2 (589.7 sq mi).