The Rocky Mountains lie to the west of the Appalachian Mountains, stretching across the western part of North America.

The Rocky Mountains are a major mountain range in North America, extending from northern Canada through the western United States to New Mexico. They are located to the west of the Appalachian Mountains, which run primarily through the eastern part of the country. The Rockies are known for their rugged terrain, high peaks, and deep valleys, offering a contrast to the more rounded peaks of the Appalachian range. This geographic separation between the Appalachians and the Rockies marks the division between the eastern and western mountain systems in the U.S.