1)
Why does the Torah need to add that Machaneh Yisrael stretched "from Beis Hayeshimos till Aveil ha'Shitim"?
1.
Rashi: To teach us that the Camp of Yisrael was twelve Mil (three Parsah) long. 1
1
Rashi: As Rabah bar bar Chanah, who saw the place, testified in Eruvin, 55b).
2)
What is the exact translation of "Aveil ha'Shitim"?