Wiktionary
footslope
n. The gently inclined hillslope at the foot of a hill
Usage examples of "footslope".
A scattering of pine trees marched along the stony footslopes of this Rocky Mountain outlier, joined here and there by clumps of aspen.
It was like the first casual step onto the tame footslopes of a mountain, unweighted by any sense of the dangers that undoubtedly lay ahead.