Q: Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.
Context: The Ayalon River (Hebrew: , Nahal Ayalon; Nahr el-Barideh or Wadi Musrara in Arabic) is a perennial stream in Israel, originating in the Judean Hills and discharging into the Yarkon River in the area of Tel Aviv.
Question: What river does Ayalon River form a part of?
A:
yarkon river