Deuteronomy 4:48

New English Translation

⁴⁸Their territory extended^[a] from Aroer at the edge of the Arnon valley as far as Mount Siyon^[b]—that is, Hermon—

Deuteronomy 4:48 tn The words “their territory extended” are supplied in the translation for stylistic reasons. In the Hebrew text vv. 47-49 are all one sentence, but for the sake of English style and readability the translation divides the text into two sentences.
Deuteronomy 4:48 sn Mount Siyon (the Hebrew name is שִׂיאֹן [siʾon], not to be confused with Zion [צִיּוֹן, tsiyyon]) is another name for Mount Hermon, also called Sirion and Senir (cf. Deut 3:9).

New English Translation (NET)