Wadi al-Far'a (Arabic name) or Nahal Tirzah (Hebrew name) is a stream in the northern West Bank that empties into the Jordan River south of Damia Bridge (Arabic: Jisr Damiya). 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.