1)
Why does it specify "Eretz Pasros"?
1.
Malbim: This is where they dwelled when they first became a nation.
2)
What is "Mechurasam"?
1.
Rashi #1: It is Megurasam (where they lived).
2.
Rashi #2, Menachem: It is like Toldosam (their birthplace).