Bible Encyclopedias
Mount of the Valley
International Standard Bible Encyclopedia
 Zereth-shahar is said to be situated in or on the "mount of the valley" ( העמק בּהר  ,   behar     hā‛ēmeḳ    Joshua 13:19 ). Cheyne (Encyclopaedia Biblica , s.v.) says "i.e. on one of the mountains East of the Jordan valley (compare Joshua 13:27 ), and not impossibly on that described at length in BJ , VII, vi, 1-3." To the Northwest of this mountain is Wâdy  eṣ -Ṣara , wherein there may be a reminiscence of Zereth-shahar. There is no certainty. 
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Bibliography Information
Orr, James, M.A., D.D. General Editor. Entry for 'Mount of the Valley'.  International Standard Bible Encyclopedia. https://www.studylight.org/​encyclopedias/​eng/​isb/​m/mount-of-the-valley.html. 1915.