thephotosocietyのインスタグラム(thephotosociety) - 9月6日 06時24分

Photo by Pete McBride @pedromcbride | Sandy Serenity: In the San Luis rift valley, winds lift sand from dry lakes on the valley floor to form giant dunes, the tallest in North America. The constant back-and-forth of winds blows sand from the valley floor to the mountains and vice versa during storms, helping maintain the dunes’ height, which can reach up to 750 feet tall—before collapsing under their own weight. I’ve marveled at this ever shifting natural phenomenon my entire life. To see more wild places, follow @pedromcbride. #GreatSandDunes #nationalpark #Colorado #nature #humility #tracks #publiclands

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