The southernmost, and also the largest, stretched from the south-eastern part of the Sea of Galilee eastwards to the Yarmuk River where the borders of Israel, Jordan and Syria converge.

The issue of water sharing from the Jordan–Yarmuk system turned out to be a major problem between Israel, Syria and Jordan.

In July 1953, Israel began construction of an intake for its National Water Carrier at the Daughters of Jacob Bridge in the demilitarized zone north of the Sea of Galilee.

The scheme was technically difficult and expensive, but if it had succeeded, it would have diverted 35% of the water that Israel intended to withdraw from the upper Jordan.

[6][7] The Arab states abandoned the diversion effort, but conflict continued on the Israel–Syria border, including an Israeli air strike into Syrian territory in April 1967.

[1][4][6] The war is referenced in the famous US antiwar 1965 song "Eve of Destruction" by Barry McGuire with the line "And even the Jordan River has bodies floatin'".