Moab in Fausset's Bible Dictionary
("from father"), i.e. the incestuous offspring of Lot's older
daughter, near Zoar, S.E. of the Dead Sea (Genesis 19:37).
Originally the Moabites dwelt due E. of the Dead Sea, from
whence they expelled the Emims. Their territory was 40 miles
long, 12 wide, the modern Belka or Kerak (Deuteronomy 2:10-
11). Afterward, Sihon king of the Amorites drove them S. of
the river Amon, now wady el Mojib (Numbers 21:13; Numbers
21:26-30; Judges 11:13; Judges 11:18), which thenceforward was
their northern boundary. Israel was forbidden to meddle with
them (Judges 11:9; Judges 11:19) on account of the tie of
blood through Lot, Abraham's nephew, for Jehovah gave Ar unto
the children of Lot, having dispossessed the giant Emims. It
was only when Moab seduced Israel to idolatry and impurity
(Numbers 25), and hired Balaam to curse them, that they were
excluded from Jehovah's congregation to the tenth generation
(Deuteronomy 23:3-4). Ammon was more roving than Moab and
occupied the pastures to the N.E. outside the mountains...
Read More about Moab in Fausset's Bible Dictionary