shoulder

A bench running along a slope, parallel to a valley below, is called a shoulder, as is a short, rounded spur on a mountainside. The term is also used to designate the crease in a glaciated valley where its steeply eroded lower slopes meet the gentler angle of its upper slopes, land that remained above the ice flow. The margins of a road are also called shoulders, if they’re flat enough and wide enough for a vehicle to pull over safely.

William Kittredge