Rocky Mountain foothills near Denver
Foothills are geographically defined as gradual increases in elevation at the base of a mountain range. In terms of elevation it is opposite to a peak (summit). They are a transition zone between plains and low relief hills to the adjacent topographically high mountains. They constitute one of the four kinds of hills, the others being sand dunes, maturely dissected plains and low plateaus.
Foothills border mountains, especially those which are reached through low ridges that increase in size closer and closer to the mountain.
Areas where foothills exist, or areas commonly referred to as the foothills, include:
Another word for a foothill region is "piedmont". The Italian Piedmont region lies in the foothills of the Alps, and several other foothills in other parts of the world go by similar names.
See also