What is the meaning of "Iyei ha'Avarim"?
Rashi: It means 'desolate passes' 1 via which one crosses over Har Nevo to enter Eretz Kena'an. They were situated on the east side of Mo'av.
Targum Onkelos and Targum Yonasan: It means the desolate plains.
Hadar Zekenim (10): Iyei is like Iyei spelled with an Aleph (islands). 2 "Ha'Avarim" is an expression of Evrah (anger).
Where were these passes situated?
Rashi: They were situated on the east side of Mo'av, on a strip of land that jutted out from the Emori that bordered the River Arnon.