Saint-Mars-la-Jaille (French pronunciation: [sɛ̃ maʁ la ʒaj]; Breton: Sant-Marzh-an-Olivenn) is a former commune in the Loire-Atlantique department in western France.

[2] On 1 January 2018, it was merged into the new commune of Vallons-de-l'Erdre.

[3]

This Loire-Atlantique geographical article is a stub.

You can help Wikipedia by expanding it.