Joshua 16:5 And the border of the children of Ephraim according to their families was thus; even the border of their inheritance eastward was Atroth-addar, unto Beth-horon the upper. (JPS YLT)
Joshua 18:13 And the border passed along from thence to Luz, to the side of Luz--the same is Beth-el--southward; and the border went down to Atroth-addar, by the mountain that lieth on the south of Beth-horon the nether. (JPS YLT)