Couture-sur-Loir is a former commune in the Loir-et-Cher department of central France. On 1 January 2019, it was merged into the new commune Vallée-de-Ronsard. It is situated in the northwest of the Loir-et-Cher department, 33 km to the west of Vendôme. It lies mainly on the left bank of the river Loir. Wikipedia