John Gill Commentary 2 Chronicles 20:2

"Then there came some that told Jehoshaphat, saying, There cometh a great multitude against thee from beyond the sea from Syria; and, behold, they are in Hazazon-tamar (the same is En-gedi)." — 2 Chronicles 20:2 (ASV)

Then there came some that told Jehoshaphat
Deserters or spies, or some of the inhabitants of those parts where they had entered, who rode post haste to acquaint him with it:

saying, there cometh a great multitude against thee from beyond the sea
on this side Syria ;
that is, beyond the Dead or Salt sea, the sea of Sodom; the Targum is, ``beyond the west of Syria,'' that sea being the western boundary of it:

and, behold, they be in Hazazontamar, which is Engedi ;
(See Gill on Genesis 14:7).