Numbers 21:13 WEB

¹¹  They traveled from Oboth, and encamped at Iyeabarim, in the wilderness which is before Moab, toward the sunrise.

¹²  From there they traveled, and encamped in the valley of Zered.

¹³  From there they traveled, and encamped on the other side of the Arnon, which is in the wilderness, that comes out of the border of the Amorites: for the Arnon is the border of Moab, between Moab and the Amorites.

¹⁴  Therefore it is said in the book of the Wars of Yahweh, Vaheb in Suphah, The valleys of the Arnon,

¹⁵  The slope of the valleys That inclines toward the dwelling of Ar, Leans on the border of Moab.