Tannberg, Mountain summit on the Salzburg–Upper Austria border, Austria

Tannberg is a 786 m high elevation on the border of Salzburg and Upper Austria, east of the Mattsee. Its summit is the highest point of the Braunau am Inn district. The hill belongs to the Flysch Zone of the Northern Alps and consists of solid bedrock, not a terminal moraine.

The Tannberg is a 786 m high ridge on the border of Salzburg and Upper Austria, and its summit is the highest point of the Braunau am Inn district. It belongs to the Flysch Zone of the Northern Alps, but lies north of the line Wallersee–Straßwalchen–Vöcklatal, so it is usually counted as part of the Alpine foreland. The tongues of the Salzach and Traun glaciers, which carved the Salzburg lake plateau and met here during the strongest glaciation, left it standing free of the Alps. It is not a terminal moraine but solid bedrock.

The Tannberg is a popular excursion destination in the Flachgau region. From the summit, the view extends across the Salzburg lake district to the Northern Limestone Alps, and northwards deep into the Innviertel. Near the summit stands a Gasthaus, reachable by car from Köstendorf via a side road.

The summit lies on the border of Salzburg and Upper Austria, east of Lake Mattsee, with the Upper Austrian municipality of Lochen am See on its side and Schleedorf and Köstendorf to the south in Salzburg. A side road from Köstendorf leads by car to a Gasthaus near the top.

The Tannberg is not a moraine but solid bedrock, left exposed where the tongues of the Salzach and Traun glaciers met during the heaviest glaciation. Its summit, at 786 m, is the highest point of the Braunau am Inn district, though the peak lies on the Salzburg–Upper Austria border.