1)
Where exactly is "Midbar Tzin al-Y'dei Edom"?
1.
Rashi: It is at the south-eastern tip of Eretz Cana'an, at the foot of Yam-ha'Melach, with Mo'av next to it on its east. 1
1
East of Edom and south of the lands of Sichon and Og. The Ha'amek Davar queries this, since, since, as he proved in Chukas, 21:10, Edom was situated on the eastern edge of the southern border of Cana'an - at the foot of the Yam-ha'Melach and westwards - whereas Mo'av was situated at the southern edge of its eastern border - next to the Yam-ha'Melach and orth of Edom.