1)
What is "v'Es Kol ha'Aretz ha'Hi"?
1.
Rashi: It is the one that is judged with this destruction and uprooting.
2.
Radak: The entire land like it is, I will destroy and uproot - "Hineni Mevi Ra'ah Al Kol Basar" (verse 5), just like Yirmeyah prophesized about the nations.
3.
Radak citing Targum Yonasan: The entire land of Yisrael is Mine.