Tournon-Saint-Martin (French pronunciation: [tuʁnɔ̃ sɛ̃ maʁtɛ̃]) is a commune in the Indre department in central France.

[3] The commune is located in natural region Boischaut Nord in the parc naturel régional de la Brenne.

The commune is located on the border of the Indre-et-Loire departement (Centre-Val de Loire region) and near the Vienne departement (Nouvelle-Aquitaine region).

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