Although not the highest mountain in the Kitzbühel Alps (that honour goes to the Kreuzjoch at m above sea level (AA)), the Großer Rettenstein is the most striking in this range of otherwise gentle grass-covered mountains. It also has a mighty, craggy, summit block made of limestone, four hundred metres high, that stands atop base of grauwacke and primary rock (Urgestein - quartz phyllite). The Rettenstein is the dominating peak of the Spertental valley. Its isolated location also makes the summit an outstanding viewing point and it is therefore a popular destination. To the north the Rettenstein sends a long ridge out to the Spiessnägel, that separates the oberer Grund and unterer Grund.