Saint-Malo-de-Guersac (French pronunciation: [sɛ̃ malo də ɡɛʁsak] ⓘ; Breton: Sant-Maloù-Gwersac'h) is a commune in the Loire-Atlantique department in western France.

[3] It was created in 1925 from part of the commune of Montoir-de-Bretagne.

[4] It is located 15 km (9.3 mi) from Saint-Nazaire in Brière.

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