How tall is the tallest dune?
Great Sand Dunes has the tallest dunes in North America. Star Dune rises 750 feet from its base to its crest. High Dune rises 650 feet from its base, but because it starts on higher ground, its crest is higher above sea level that of Star Dune. The highest dunes in elevation above sea level in the park are those closest to the mountains on the eastern edge of the main dunefield.