Western
The southern part of Eastern Europe, or Southeastern Europe, is the most mountainous part of Eastern Europe.
The western part of the state is mountainous; the eastern part is flat and arid.
The western part of the US is generally more mountainous than the eastern part. States like Colorado, California, and Washington have significant mountain ranges, while the eastern US is characterized by lower, more rolling terrain.
The western part of North America since it is where the Rocky Mountains are.
that's the way it formed.
The West is way bigger because of the rockies they are the largest in the U.S.
The Eastern portion is almost completely mountainous, covered by the Scandinavian Mountains.
Both parts are mountainous. In the west, there are the Cascades, that feed into the Rocky's (but the Rocky's are not along the coast). And in the east, the are the Appalachian mountains.
There are eight states with the most mountainous region in the US. In the south, the states are Arizona, Colorado, New Mexico, Nevada, and Utah. The north west part are Idaho, Montana, and Wyoming.
The eastern part of Alaska is generally more mountainous than the western part. The Coast Mountains and the St. Elias Range, which include some of the highest peaks in North America, are located in eastern Alaska. In contrast, western Alaska features more lowland areas and gentle hills, with the Aleutian Range being less prominent compared to the towering mountains found in the east.
The western US is more mountainous than the eastern US. The Rocky Mountains run through states like Colorado, Wyoming, and Montana in the west, while the Appalachian Mountains traverse the eastern states like North Carolina, Tennessee, and New York.