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).
History
Tournon-Saint-Martin was an important crossroad. A Roman road crossed it, coming from Argenton-sur-Creuse (Argentomagus) and going to Poitiers and Tours, following 'la Creuse' river.