River, west-central Israel.
It rises near Rosh Ha-Ayin and flows westward for about 16 mi (26 km) to the Mediterranean Sea near northern Tel Aviv-Jaffa . It marks the boundary between the Plain of Sharon and the coastal lowlands. Since the construction and expansion of the Yarqon-Negev Project in the 1950s (see Negev ), the water level has gone down, and pollution has increased. During World War I (191418), it was the site of several important British victories over the Ottoman Empire in the Allied Powers' conquest of Palestine.