Dubnica nad Váhom is a town in the Ilava District, Trenčín Region in Slovakia. It is located on the Váh river, in the Ilava Basin, between th…Dubnica nad Váhom is a town in the Ilava District, Trenčín Region in Slovakia. It is located on the Váh river, in the Ilava Basin, between the White Carpathians and Strážovské vrchy mountains, at an altitude of 242 metres. The town's cadastral area is composed of Dubnica and "city part" Prejta, annexed in 1973.