[Answer] Where is the tallest freestanding sand dune in the U.S.?

Step 1 : Introduction to the question "Where is the tallest freestanding sand dune in the U.S.?"

...1. Missouri 2. North Carolina 3. Idaho 4. New Mexico

Step 2 : Answer to the question "Where is the tallest freestanding sand dune in the U.S.?"

Idaho - Although the tallest sand dunes in the United States are the Great Sand Dunes of southern Colorado, which tower over 700 feet high, the tallest freestanding dunes (not part of a dune system) are the dunes at Bruneau Dunes State Park in southwestern Idaho. The dunes here extend up to 470 feet in height. They are the only dunes in the Western Hemisphere that have formed near the center of a basin, while other dunes form at a basin's edge. Experts believe these dunes started about 15,000 years ago during a period of flooding. They remain stable and, unlike other dunes, do not drift.:

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