The poplar grove of Plantío Real Nature · Villafranca de Duero, Tierra del Vino, Valladolid Image of Villafranca de Duero, not of the place itself. On the left bank of the Duero, next to the San José reservoir, extends this poplar grove that shades a municipal district of barely ten square kilometres at 626 metres, the lowest point in the comarca. Photo: David Perez (CC BY 4.0) What to see and do in Villafranca de Duero