The tallest peak in the whole region, snow-capped for most of the year, and the northern anchor of everything Israel takes from the two Amorite kings — the war's scope is given as running 'from the brook Arnon to Mount Hermon' (Deuteronomy 3:8). ★ It carries three names at once, one per nation that used it: Hermon to the Israelites, Sirion to the Sidonians, Senir to the Amorites (v9) — the same three-names-one-thing device this book has just spent a whole chapter running on the Rephaim, now applied to a mountain instead of a people. ⚠ Later books keep multiplying the names rather than settling on one: Song of Songs 4:8 addresses Senir and Hermon as though they were two separate peaks, and Psalm 29:6 pairs Sirion with Lebanon. Its snowmelt is the principal source of the Jordan. ⚠ Deuteronomy 4:48 (already on these pages) supplies a FOURTH name — ‘Mount Sion’, spelled with a sin and an aleph, most likely a scribal variant of Sirion itself (one letter swapped) and emphatically not the Zion of Jerusalem, which is spelled with a tsade. The NIV and TLB both translate it outright as ‘Mount Sirion’; every other version keeps the literal, ambiguous ‘Sion’.