the highest, most continuous mountain chain, dramatic, rugged mountains, the "young" mountain range, large, rounded, forested mountain range, the "old" mountain range, extensive, high-altitude plain, known for farming, extensive, low-lying wetland, slow-moving river system, massive canyon carved by the Colorady River in the high plateau region of Arizona, famous valley in Southern California, the lowest elevation point in North America, the largest concentration of population and industry along the Northeast Atlantic coastline, long, flat, highly agricultural valley running through central California, a premier temperate rainforest, abundant rainfall, massive moss-draped conifers, a region in the mainland USA known for the geothermal, volcanic activity, a region known for the geothermal, volcanic activity, a vast, predominantly flat to gently rolling area, fertile agricultural plains, expansive grasslands

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