Wadi al-Far'a or Tirzah Stream is a stream in the northern West Bank that empties into the Jordan River south of Damia Bridge. It is the largest stream in the West Bank. Wadi al-Far'a is located in the rugged area of the West Bank and cuts east through the Jordan Valley, passing through the Palestinian village of Wadi al-Far'a. The Tirzah Reservoir is used to collect the floodwater of Wadi al-Far'a before it flows into the Jordan River.