black-white, a stream on the borders of Asher, probably the modern Nahr Zerka, i.e., the "crocodile brook," or "blue river", which rises in the Carmel range and enters the Mediterranean a little to the north of Caesarea (Jos 19:26). Crocodiles are still found in the Zerka. Thomson suspects "that long ages ago some Egyptians, accustomed to worship this ugly creature, settled here (viz., at Caesarea), and brought their gods with them. Once here they would not easily be exterminated" (The Land and the Book).

One of the boundaries of Asher (Jos 19:26). It stands apparently for a river, most probably the Nahr ez-Zerka, the Crocodile River.