at.rot ad.dar is a proper place name marking a boundary location in Joshua.

The term appears as a proper place name in boundary descriptions: Joshua 16:5 places it on Ephraim’s eastern boundary, while Joshua 18:13 names it as the point to which a border descends south of Lower Beth-horon.

1. Place name in boundary descriptions · dominant

   In Joshua 16:5, the proper noun occurs in the statement of Ephraim’s inheritance boundary; the APB renders the clause "eastward at Ataroth-addar as far as Upper Beth-horon." In Joshua 18:13, the border descends to this named location on the mountain south of Lower Beth-horon.

   Joshua 16:5Joshua 18:13

In the Anselm Project Bible: The APB presents the term as "Ataroth-addar" in both boundary descriptions. It confirms the location’s role in each clause rather than isolating further nuance.