1)
What is Eretz Tapu'ach?
1.
Rashi: It is the villages and their Chatzeros (Malbim - north of Tapu'ach). The city itself was of Efrayim.
2)
What is the meaning of "El Gevul Menasheh"?
1.
Rashi: It was at the end of Menasheh's border.