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great sand dunes national park. Colorado 37°44′N 105°31′W / 37.73°N 105.51°W. Founded September 13, 2004. 42,983.74 acres (173.9 km2)
Great Sand Dunes National Park. The tallest dunes in North America are up to 750 feet (230 m) tall and neighbor grasslands, shrublands and wetlands. They were formed by sand deposits of the Rio Grande on the San Luis Valley. The park also has alpine lakes, six 13,000-foot mountains, and ancient forests.