Dent de Perroc, Mountain peak in Valais, Switzerland

Dent de Perroc is a peak in the Pennine Alps that rises to 3,676 meters with steep rock walls and a marked west ridge running along its structure. The sharp slopes and rocky surfaces create a distinctive form that dominates the view from Arolla Valley below.

The Dent de Perroc was first climbed on 31 August 1871 by A. B. Hamilton, W. R. Rickman, Jean Anzévui and Jean Vuignier. The summit, 3,676 metres high, had earlier been known as Lex blava, the "greyish wall".

Perroc comes from a place-name in the Ferpècle valley meaning a stony spot, not from a word for tooth. The summit was formerly called Lex blava, "the greyish wall". The name thus records the terrain rather than the peak's outline.

The route starts from Arolla village and leads to Cabane de la Tsa, from which technical climbing sections begin. Rope and climbing gear are required, and climbers need experience on steep rock faces.

The summit was long known as Lex blava, "the greyish wall", before the name Perroc, referring to a stony place, was applied to it. The first ascent was made on 31 August 1871 by A. B. Hamilton, W. R. Rickman, Jean Anzévui and Jean Vuignier.