Charles Ellicott Commentary Numbers 21:20

"and from Bamoth to the valley that is in the field of Moab, to the top of Pisgah, which looketh down upon the desert." — Numbers 21:20 (ASV)

And from Bamoth in the valley.— Better, and from Bamoth to the valley that is ... The country (or, rather, field) of Moab was a portion of the table-land which stretches from Rabbath Ammân to the Arnon. The valley in this table-land was upon the height of Pisgah—i.e., the northern part of the mountains of Abarim.

Toward Jeshimon.— Or, across the waste (or, desert).