Jabbok

a pouring out, or a wrestling, one of the streams on the east of
Jordan, into which it falls about midway between the Sea of
Galilee and the Dead Sea, or about 45 miles below the Sea of
Galilee. It rises on the eastern side of the mountains of
Gilead, and runs a course of about 65 miles in a wild and deep
ravine. It was the boundary between the territory of the
Ammonites and that of Og, king of Bashan (Josh. 12:1-5; Num.
21:24); also between the tribe of Reuben and the half tribe of
Manasseh (21:24; Deut. 3:16). In its course westward across the
plains it passes more than once underground. "The scenery along
its banks is probably the most picturesque in Israel; and the
ruins of town and village and fortress which stud the
surrounding mountain-side render the country as interesting as
it is beautiful." This river is now called the Zerka, or blue
river.