1)
What is the meaning of "v'Hayu Totz'osav Yamah"?
1.
Metzudas David: Menasheh's border ended at the sea.
2.
Malbim (8): The entire northern border until the sea was of Menasheh, but in the south, from Tapu'ach until the sea, the north was of Menasheh, and the south was of Efrayim. These are he'Arim ha'Mivdalos (verse 2).