Polydrossos of Parnassus is one of the major villages of Phocis, situated at an altitude of 380 meters on the SE slopes of Parnassus.

The older name of the village, until 1928, was Souvala, of Turkish origin, meaning "much water". Another version for the previous name is that it comes from the Slavic word Souvala, meaning "pit with surrounding mountains", or according to A. Papachristou, it derives from the Slavic word Suvala which means "swamp".

It was built by the residents of the current Ano Polydrosso (Ano Souvala) who they came after the devastating earthquake of 1870. It has abundant waters and a nice view of the basin Lilea - Gravia.
Polidrossos is located in the middle of a forest full of fir, pine, apple and cherry trees that create a magical landscape, which transforms the village into a beautiful winter and summer resort.

In a distance of 2 km on west, there is a Byzantine monument of great value, Paleopanagia (or Mavromantila or St. Eleousa), a cruciform church of rare architectural beauty (the monument is dated back to the second half of the 6th or the early 7th century, but the chronological limits should be broadened until the 10th century, because of the sources and of the ancient temple ruins (perhaps of Charites).

In recent years, it is experiencing significant tourism development because of the proximity and of the short distance from Parnassus ski resorts.