DCHP-1 Online
foothills 
n. pl. the rounded, rolling hills, largely grassland, lying between the prairies and the Rocky Mountains proper.
See also: high country ((2))
- 1853 . . . the great prairies stretch westward, even to the "foot-hills" (piedmont) of the Rocky Mountains.
- 1916 The outward trail over the prairie petering off into the foot-hills and the Rockies is to him not a mere waggon road. . . .
- 1966 The scheme would trap water in the Rocky Mountains and foothills of western Alberta and distribute them [sic] eastward to the Saskatchewan border.
- 1853 . . . the great prairies stretch westward, even to the "foot-hills" (piedmont) of the Rocky Mountains.