Rashbam on Genesis
הארץ אשר אתה שוכב עליה לך אתננה ולזרעך, if you were to say that this promise entails so very little, I am adding that your descendants will spread out in all directions of the globe.
Sforno on Genesis
הארץ אשר אתה שוכב עליה, a reference to the region currently known as “the land of Canaan,”