Sea of Sand: A History of Great Sand Dunes National Park and
Sculpted into graceful contours by countless centuries of wind and water,the Great Sand Dunes sprawl along the eastern fringes of the vast San Luis Valley of south-central Colorado. Covering an area of nearly thirty square miles,they are the tallest aeolian,or wind-produced,dunes in North America,towering 750 feet above the valley floor. With the addition of the enormous Baca Ranch and other adjacent lands,the dunesoriginally designated as a National Monument in attained official Nation