Großer Rosennock, Mountain summit in the Nock Mountains, Radenthein, Austria

The Großer Rosennock is a grassy, rounded summit in the Nock Mountains of the Gurktaler Alpen in Carinthia, reaching 2,440 m and second only to the Eisenhut, one metre higher. North of the main peak stands the craggier Kleiner Rosennock (2,361 m), separated by a narrow, rocky ridge; below the two peaks, in a cirque to the east, lies the Nassbodensee at 2,029 m.

The Rosennock massif lies in the Nockberge, part of the Gurktal Alps in Carinthia. Its main summit, the Großer Rosennock, reaches 2,440 m and is the second-highest peak of the range, one metre below the Eisenhut. The Kleine Rosennock (2,361 m) adjoins it to the north, and the Nassbodensee lies in a cirque east below the two summits.

The name Rosennock combines "Rose" with "Nock", the rounded grassy summit typical of the Nockberge. The Kaninger Wolitzenalm on the north side, at around 2,000 m, is a working alpine pasture, and the Wollgrastümpel pond there is named for the dense stands of Scheuchzer's cottongrass around it. The Nassbodensee, a small tarn below the peaks, is a spawning site for the alpine newt.

The hike from Erlacherhütte (at 1,636 meters) takes roughly three and a half to four hours to reach the summit. Sturdy footwear and weather-appropriate clothing are essential due to changing mountain conditions.

The Nassbodensee lies at 2,029 m in a cirque east of the two summits, a 0.35-hectare lake without an outflow whose level swings and which is at most three metres deep. A ground moraine beneath the cirque floor points to small local glaciation during the Würm ice age, rare in the Nockberge. Alpine newts spawn in the lake.