Numbers 21:15

Modern

…even the slopes of the wadis that extend to the site of Ar and lie along the border of Moab.”

Traditional

And at the stream of the brooks that goeth down to the dwelling of Ar, and lieth upon the border of Moab.

Literal

…and the slope of the brooks that reaches to the dwelling of Ar and lies on the border of Moab.”

Latin

Scopuli torrentium inclinati sunt, ut requiescerent in Ar, et recumberent in finibus Moabitarum.

Hebrew

English

…even the slopes of the wadis that extend to the site of Ar and lie along the border of Moab.”

the Book of the Wars of the LORD: This is similar to The Book of Jashar (Joshua 10:13; 2 Samuel 1:18). The Book of the Wars of the Lord is not known from any other source.
Waheb, a town, and Suphah, a region, are not known from any other record. Their exact locations are unknown.
Ar was one of the main settlements of Moab at that time (compare 21:28; Deuteronomy 2:18; Isaiah 15:1).

As Israel journeyed to the promised land, they traveled from Mount Hor to the plains of Moab (22:1). The story of Israel's journey emphasizes the Lord's patient plan to lead Israel into Canaan despite their weaknesses.
The general direction of their travel is clear. However, the exact path they took is not known today. Many of the places mentioned are difficult to identify.
Archaeological evidence at some sites does not match the time usually connected with the wilderness period. Because of this, there are still serious questions about geography and history in the wilderness journey.

Deuteronomy 2:18
“Today you are going to cross the border of Moab at Ar.
Numbers 21:28
For a fire went out from Heshbon, a blaze from the city of Sihon. It consumed Ar of Moab, the rulers of Arnon’s heights.
Deuteronomy 2:9
Then the LORD said to me, “Do not harass the Moabites or provoke them to war, for I will not give you any of their land, because I have given Ar to the descendants of Lot as their possession.”
Deuteronomy 2:29
…just as the descendants of Esau who live in Seir and the Moabites who live in Ar did for us, until we cross the Jordan into the land that the LORD our God is giving us.”
Isaiah 15:1
This is the burden against Moab: Ar in Moab is ruined, destroyed in a night! Kir in Moab is devastated, destroyed in a night!

Ar: The capital city of Moab Moab: Ancient kingdom east of the Dead Sea in Jordan