Easton's Bible Dictionary (1897)
The splendour of the dawn, a city “in the mount of the valley” (Josh. 13:19). It is identified with the ruins of Zara, near the mouth of the Wady Zerka Main, on the eastern shore of the Dead Sea, some 3 miles south of the Callirrhoe. Of this town but little remains. “A few broken basaltic columns and pieces of wall about 200 yards back from the shore, and a ruined fort rather nearer the sea, about the middle of the coast line of the plain, are all that are left” (Tristram’s Land of Moab).
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
ZA'RETH-SHA'HAR (splendour of the dawn), a city in Reuben, on a hill in a valley. Josh 13:19. About a mile and a half east of the Dead Sea, near the mouth of the Wady Zerka Main, is a place called Zara, or Sara, a heap of stones in a little green plain, which may mark the site.