Piran is one of the plain and mountain villages that considering its suitable water resource, it has a very favorable condition for attracting tourists. Several gardens, Piran waterfall and the natural and incredible texture of this region and being close to Sar-e Pol-e Zahab town attracts many enthusiasts to this place.
Piran or Rijab waterfall is one of the highest waterfalls of Iran which is located in Kermanshah province. Rijab waterfall is a three floored waterfall, which the upper two levels are very high and the lower level is shorter. The third level of Rijab waterfall is located under trees and cannot be seen from above.
This waterfall is registered in the list of national and natural relics.