2 occurrences in 2 dictionaries
Reference: East Sea
Easton
(Joe 2:20; Eze 47:18), the Dead Sea, which lay on the east side of the Holy Land. The Mediterranean, which lay on the west, was hence called the "great sea for the west border" (Nu 34:6).
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Fausets
Joe 2:20; Eze 47:18. Literally, the front sea, i.e. the Dead Sea, which one looking E. would face; "the utmost (hinder) sea" is the Mediterranean, at such a one's back (Nu 34:6).