The West part of the United States has fewer mountains.
east
east
The great plains have the fewest mountains. I guess that would be more north than south, east or west.
The north west has the highest mountains
The part of the US with the fewest mountains is generally the eastern region, particularly states along the East Coast. This area is known for its flatter terrain compared to the western and southern regions, which have more mountainous landscapes like the Rockies in the west and the Appalachians in the south.
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The Great Plains and the Gulf and East coastal areas.
The Appalachian Mountains are located at the east of the US.
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The Ural and Caucasus mountains.
in all my years i'd say east and west