Sex de Marinda, Mountain summit in Valais, Switzerland.

Sex de Marinda is a 2,906 m summit in the Pennine Alps of Valais, rising above the resort of Grimentz and east of the Sasseneire (3,254 m). Its name derives from the Latin saxum, meaning rock; the alternative form Ché de Mareinda is also used. At its eastern foot lies the Lac de Moiry reservoir, and to the northeast stretches the Lona plateau with the Lac de Lona.

The name Sex derives from the Latin saxum, meaning rock, as recorded for this 2,906 m peak above Grimentz in the Val d'Anniviers. The mountain stands west of the Lac de Moiry reservoir and east of the 3,254 m Sasseneire. A small road popular with mountain bikers crosses between Sex de Marinda and Sasseneire via the 2,792 m Basset de Lona up to the Lona plateau.

The name Sex comes from the Latin saxum, meaning rock, and the alternative form Ché de Mareinda is still used locally. The mountain rises above Grimentz in the Val d'Anniviers, and the small road between it and the Sasseneire, crossing the Basset de Lona at 2,792 m, is popular with mountain bikers heading to the Lona plateau.

The ascent follows marked trails from Grimentz and typically takes about four hours in normal conditions. Start early in the day and monitor weather closely, as conditions at altitude can change rapidly.

The summit forms a natural corridor with nearby Basset de Lona, allowing wildlife to move between different Pennine valleys. This geographical link makes the location an important passage for the region's animal populations.