The Ayalon River is a perennial stream in Israel

Israel

The State of Israel is a parliamentary republic located in the Middle East, along the eastern shore of the Mediterranean Sea...

, originating in the Judean Hills and mouthing into the Yarqon River in the Tel Aviv

Tel Aviv

Tel Aviv , officially Tel Aviv-Yafo , is the second most populous city in Israel, with a population of 404,400 on a land area of . The city is located on the Israeli Mediterranean coastline in west-central Israel. It is the largest and most populous city in the metropolitan area of Gush Dan, with...

 area.
The total length of Ayalon River is about 50 kilometres and it drains an area of 815 square kilometres. The river flows through the Shephelah

Shephelah

The Shephelah is a designation usually applied to the region in south-central Israel of 10-15 km of low hills between the central Mount Hebron and the coastal plains of Philistia within the area of the Judea, at an altitude of 120-450 metres above sea level. The area is fertile, and a temperate...

 region, from the Judean Hills within Ayalon Valley, near the Ben Gurion Airport, along Ayalon Freeway and mouths with the Yarkon River in Bavli Quarter

Bavli

Bavli is a neighborhood in central Tel Aviv, Israel, named after the Babylonian Talmud, and bounded by Hayarkon Park on the north, Ayalon highway to the east, Namir road to the west and Park Tzameret to the south. It was founded in 1957 and developed rapidly over the 1970s and 1980s...

 in Tel Aviv. In the past, the river mouthed into the Mediterranean sea near Jaffa

Jaffa

Jaffa is an ancient port city believed to be one of the oldest in the world. Jaffa was incorporated with Tel Aviv creating the city of Tel Aviv-Yafo, Israel. Jaffa is famous for its association with the biblical story of the prophet Jonah.-Etymology:...

but in order to prevent floods in residential areas its course was deviated.