Saint-Martin-de-Seignanx (French pronunciation: [sɛ̃ maʁtɛ̃ də sɛɲɑ̃]; Gascon: Sent Martin de Senhans) is a commune in the Landes department in Nouvelle-Aquitaine in southwestern France.

[3] Saint-Martin-de-Seignanx is a sister city of the Spanish town Oyón-Oion.

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