They are found in the western part of Slovakia , between Bratislava and NovÃ Mesto nad VÃ hom , and in Northeastern Austria . The mountains are situated in Western Slovakia , covering the area from Bratislava to NovÃ Mesto nad VÃ hom , a very small part called Hundsheimer Berge ( or Hainburger Berge ) is situated south of DevÃ n Gate in northeastern Austria .