Nothing.
The Rocky Mountains
Rocky Mountains and Appalachian Mountains.
western
the rocky mountains
Rocky Mountains
The Rocky Mountains
The typical elevation gain when hiking in the Rocky Mountains can range from 1,000 to 3,000 feet, depending on the specific trail and location.
This is the Rocky Mountains, a range of mountains in the west in the US.
the Rocky Mountains
The Rocky Mountains
The rocky mountains are obviously in the western part
The Rocky Mountains and the Appalachian Mountains.