Easton's Bible Dictionary (1897)
Height, a town of Moab, or simply, the height=the citadel, some fortress so called; or perhaps a general name for the highlands of Moab, as some think (Jer. 48:1).
Smith's Bible Dictionary (1863)
(height), a place in Moab.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
MIS'GAB (high place), a place in Moab. Jer 48:1. " It seems to refer to some special fortress, probably Kir-hareseth.