Lake Neusiedl (German: Neusiedler See) or Fertő (Hungarian: Fertő (tó); Croatian: Nežidersko jezero, Niuzaljsko jezero; Slovene: Nežidersko jezero; Slovak: Neziderské jazero; Czech: Neziderské jezero) is the largest endorheic lake in Central Europe, straddling the Austrian–Hungarian border.