Among the perennial streams may be mentioned the Na'aman, south of Acre; the Mukatta` Kishon, at Haifa; the Nahr ez-Zerka, sometimes called the Crocodile River - so named from the crocodiles still occasionally to be seen in it; the Nahr el-Falik; the `Aujeh a few miles north of Jaffa and the Nahr Rubin.
The chief valleys of this region are the Nahr Na'aman and its branches, which runs into the sea south of Acre, and the Wadi Mukatta`, or Kishon, which joins the sea at Haifa.
The whole drainage is collected by the Kishon, which runs through a narrow gorge at the north-west corner of the plain, descending beside the ridge of Carmel to the sea.