Saint-Mars-sous-Ballon (, literally Saint-Mars under Ballon) is a former commune in the Sarthe department in the region of Pays de la Loire in north-western France. On 1 January 2016, it was merged into the new commune of Ballon-Saint-Mars.Arrêté préfectoral 7 August 2015 Its population was 871 in 2018.
See also Communes of the Sarthe department
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