Ezion-geber

the giant's backbone (so called from the head of a mountain which runs out into the sea), an ancient city and harbour at the north-east end of the Elanitic branch of the Red Sea, the Gulf of Akabah, near Elath or Eloth (Num 33:35 ; Deut 2:8 ). Here Solomon built ships, "Tarshish ships," like those trading from Tyre to Tarshish and the west, which traded with Ophir (1Kings 9:26; 2Chr 8:17 ); and here also Jehoshaphat's fleet was shipwrecked (1Kings 22:48; 2Chr 20:36 ). It became a populous town, many of the Jews settling in it [(2Kings 16:6), "Elath"]. It is supposed that anciently the north end of the gulf flowed further into the country than now, as far as 'Ain el-Ghudyan, which is 10 miles up the dry bed of the Arabah, and that Ezion-geber may have been there.

EBD - Easton's Bible Dictionary