The Dreiländereck (also Ofen; Slovene: Peč; Italian: Monte Forno) is a mountain in the Karawanks whose summit is the tripoint of the countries of Austria, Italy, and Slovenia. It thus is also the meeting point of three linguistic regions, German, Italian, and Slovene. The height of the summit is 1,508 m (AA).

The municipalities which meet at the tripoint are Arnoldstein (Villach Land) in the Austrian state of Carinthia, Kronau or Kranjska Gora (part of Ratschach or Rateče) in Slovenia, and Tarvis or Tarvisio (Friuli-Venezia Giulia) in Italy.

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  Boundary stone

The German word Ofen and the Slovenisan word peč, German loanword Pötsche, both mean 'rock' or 'cave' in this context, although the word also means 'oven'. The Italian name is the literal translation (forno 'oven'). Dreiländereck (German for "three-land corner" -- i.e., "tripoint") is a modern creation.

Because three linguistic regions meet here, the mountain is comparable to the Dreisprachenspitze (German for "three-language peak") on the Stilfser Joch.

The mountain has been developed into a skiing area with eight lifts and 17 km of piste served by the Dreiländereck Lift System (Dreiländereck Bergbahnen).

• Hiking around the Dreiländereck Archived 2014-10-14 at the Wayback Machine, Arnoldstein