יהושע, פרק ט״ז, פסוק ז׳

The geographic route outlined here finalizes the eastern edge of the tribe of Ephraim's land, effectively enclosing their territory on all sides [מלבי״ם, ביאור שטיינזלץ]. At a specific point, the wide expanse of their territory comes to an end, and the boundary line begins a descent eastward toward Ataroth [מצודת דוד]. This downward path moves diagonally, causing the northern border to draw steadily closer to the southern border [מלבי״ם].

From there, the line travels onward to a location identified as Naarah or Naaran [ביאור שטיינזלץ]. As the boundary approaches the area of Jericho, it specifically meets the waters of Jericho [מצודת דוד]. Because the northern and southern borders converge so closely at this junction, the tribe of Ephraim is left with only a short, narrow strip of land in this region [מלבי״ם]. Finally, the border passes through these waters and reaches its ultimate stopping point at the Jordan River [מצודת דוד].