the chief mountain range of western North America; extends from British Columbia to northern New Mexico; forms the continental divide
"The hikers trekked through the Rockies, marveling at how this vast mountain range stretches from British Columbia down to northern New Mexico and marks the continent's highest divide."
plural of Rocky
"The Rockies are famous for their stunning mountain scenery and hiking trails."
The Rocky Mountains, a mountain range in North America.
"The climbers spent their first night camping at the base of the Rockies before beginning their ascent."