Hallstatt.

The second element is Statt (“place, stead”). Traditionally the first element is taken to be a borrowing from Celtic for ‘salt’, such as Welsh halen or Breton holen; see Proto-Celtic *salanos. David Stifter rejects the traditional etymology because of several problems, among them: * the element hall- exists only in names of places settled by Germanic speakers (and nowhere else in the Celtic-speaking areas), * the *s > *h sound change is not attested in Continental Celtic, * derivation from the ‘salt’ word would have given a non-geminated final l. He instead derives it from Proto-Germanic *hallą, from Proto-Indo-European *kHlnom (“hardened skin, encrustation”), referring to encrusted salt forming during the simmering of brine.