Helam

From BibleEncyclopedia.Net

hē´lam (חילם, ḥēlām, "place of abundance"; 2 Samuel 10:16 f; in 2Samuel 16:17 with the he of locale; Septuagint Ἁιλάμ, Hailám):

A place near which David is said to have defeated the Aramean world under Hadarezer (2 Samuel 10:16). Its site is unknown. It is probably a place on the east of Jordan and west of the Euphrates where David gained a great victory over the Syrian army, which was under the command of Shobach. Some would identify it with Alamatta, near Nicephorium.

Cornill and others introduce it into the text of Ezekiel 47:16 (from the Septuagint Ἡλιάμ, Hḗliám). This would place it between the territories of Damascus and Hamath, which is not unreasonable. Some scholars identify it with Aleppo, which seems too far north.