This was the border of the children of Ephraim according to their families:
the border of their inheritance in the east was Ataroth-addar to Upper Beth-horon. Bible see other translations

“the border of their inheritance.” The author now goes back and very briefly describes the southern border of Ephraim, which borders Benjamin and has already been described in more detail in Joshua 16:1-3 (in the next verse, Josh. 16:6, the northern border is being described; the border with the tribe of Manasseh). Why the author goes back and redescribes the southern border is not known.

Commentary for: Joshua 16:5