The largest overall valley in the United States is California's magnificent Central Valley, which stretches approximately four hundred miles long and spans over twenty-two thousand square miles across the state's interior. Enclosed between the Sierra Nevada mountains to the east and the Coast Ranges to the west, it functions as one of the most productive agricultural regions globally. Additionally, in terms of high-altitude alpine basins, Colorado's San Luis Valley covers nearly eight thousand square miles as a massive structural depression.
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