Rashi on Deuteronomy 2:3/רש"י על דברים ב׳:ג׳

1פנו לכם צפנה TURN YOU NORTHWARD — Turn you along the eastern side of Moab, from the south to the north, your faces directed to the north. Consequently they were travelling along the east side of Moab, and this is what is meant by (Judges 11:18) “And they came by the east side of the land of Moab”.