Tremblay is a former commune in the Ille-et-Vilaine department of Brittany in northwestern France. On 1 January 2019, it was merged into the new commune Val-Couesnon.
Wikipedia https://en.wikipedia.org/wiki/Tremblay,_Ille-et-Vilaine
Coordinates 48°25'21.614" N -1°28'32.435" E