
Fig. 1Dune crests under a snowy Sangre de Cristo wall
Landform
The tallest dunes in North America, stacked against the Sangre de Cristo Range. Alpine desert — snow peaks over a sand sea.
Field note
Prevailing winds drop San Luis Valley sand against the mountains. Star Dune tops 750 feet. Medano Creek can run as a beach in late spring — a rare alpine playa.














