The Rocky Mountains
rocky
East Coast
Appalachian Mountains
The Sierra Nevada Mountain range and Cascade mountains
The Rocky Mountains
The Rocky Mountains
The Rocky Mountains
The Appalachian Mountains run fairly parallel to the East Coast of the US. The Rockies run down the West Coast.
rocky
Since parts of the east and west coasts of the US are roughly parallel, something parallel to one of them would be parallel to the other. The Appalachians are closer to the east coast than the west.
East Coast
The Rocky Mountains are on the west side of the US.
Appalachian Mountains
The Coastal Range.
Sierra Mountains and the Cascade Mountains.
The Sierra Nevada Mountain range and Cascade mountains