Deuteronomy 4:48
From Aroer, which is by the bank of the river Arnon, even unto mount Sion, which is Hermon,
Cross-reference
Deuteronomy 2:36 describes the capture of Aroer and the Arnon valley, part of the southern border mentioned here.
Deuteronomy 3:9 explains that Mount Sirion is also called Hermon, clarifying the name used in this verse.
Deuteronomy 3:12 details the land given to Reuben and Gad from Aroer to Gilead, matching the extent in this verse.
Joshua 13:24-33 assigns the inheritance to Reuben, Gad, and half-Manasseh, covering the same territory described here.
Joshua 12:1 summarizes the same conquered territory 'from the Valley of the Arnon to Mount Hermon' — directly parallel to this verse.
Joshua 12:5 includes Mount Hermon in the list of conquered regions under King Og — consistent with this boundary description.
Joshua 13:11 includes 'all Mount Hermon' in the land allocation for the eastern tribes — same geographic reference.