GOD'S WORD® Translation
Arnon and the slopes of the valleys that go down to the site of Ar and lie along the border of Moab...."

American Standard Version
And the slope of the valleys That inclineth toward the dwelling of Ar, And leaneth upon the border of Moab.

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

Douay-Rheims Bible
The rocks of the torrents were bowed down that they might rest in Ar, and lie down in the borders of the Moabites.

English Revised Version
And the slope of the valleys That inclineth toward the dwelling of Ar, And leaneth upon the border of Moab.

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

World English Bible
the slope of the valleys that incline toward the dwelling of Ar, leans on the border of Moab."

Young's Literal Translation
And the spring of the brooks, Which turned aside to the dwelling of Ar, And hath leaned to the border of Moab.'

Numbers 21:15 Additional Translations ...