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 languages: German, Italian, and Slovene.

The municipalities that meet at the tripoint are Arnoldstein in the Austrian state of Carinthia, Kranjska Gora in the Upper Carniola region of Slovenia, and Tarvisio in the Italian autonomous region of Friuli-Venezia Giulia.

The mountain's German and Slovene names Ofen and Peč both mean 'cliff' or 'cave', although the Slovene word peč (which is also present in German as the loanword Pötsche) can secondarily mean 'oven'.

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