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.