Which North American region lies west and north of the Piedmont and is an internally complex zone of higher and rougher country reaching altitudes of 3,000-6,000 feet?

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The Appalachian Highlands lie to the west and north of the Piedmont and are characterized by higher and rougher terrain, with altitudes reaching 3,000-6,000 feet. The West generally refers to the western region of the United States, while the Atlantic coastline and Gulf Coast are coastal regions. The Ozark Mountains are located further west, in the Midwest region.

Which North American Region Lies West and North of the Piedmont