The Valle Po (Po valley), is a valley of Cottian Alps in the province of Cuneo, Piedmont, northern Italy, run by the Po River before it enters the Pianura Padana (or Plain of the Po). It gives rise to the longest river in Italy, the Po. It has a length of some 32 km, from Saluzzo to Crissolo, and is home to the Monviso mountain. It is bounded by the Val Pellice, Valle Varaita and the Valle del Guil. Gives rise to Traversette pass (Colle delle Traversette) (2950 m above sea level) and passes through the King's plain (Pian del Re) (2020 m) where the Po river has its source.