The region of Tappuah belonged to Manasseh, but Tappuah itself, on the border of Manasseh, belonged to Ephraim.
We have here a short account of the lot of this half tribe. It reached from Jordan on the east to the great sea on the west; on the south it lay all along contiguous to Ephraim, but on the north it abutted upon Asher and Issachar.
Commenting on Joshua 17:7-13
Now Manasseh had the land of Tappuah,.... The whole territory that went by that name, from a city of note in it, next mentioned; all the fields and villages in it belonged to the tribe of Manasseh: but Tappuah on the border of Manasseh belonged to the children of Ephraim; and was one of those separate cities they had among the inheritance of the children...
THIS COAST. (Jos 17:7-11) the coast of Manasseh was from Asher to Michmethah--The southern boundary is here traced from the east. Asher (now Yasir), the starting point, was a town fifteen Roman miles east of Shechem, and anciently a place of importance.
Commenting on Joshua 17:7-11