The meaning of Mount of the valley in the Bible
(From Easton's Bible Dictionary)

(Joshua 13:19), a district in the east of Jordan, in the territory of Reuben. The "valley" here was probably the Ghor or valley of the Jordan, and hence the "mount" would be the hilly region in the north end of the Dead Sea. (See ZARETH-SHAHAR.)

See more on the meaning of Mount Of The Valley in the Bible:
Mount Of The Valley {International Standard Bible Encyclopedia}

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