William (Bill) Armstrong's photos with the keyword: sand dunes

Wind action creates ripples and sculpted lines on active dunes in the Great Sand Hills. The area also has patches of vegetation that manage to survive.

What was once a tree engulfed by a shirting sand dune in the Great Sand Hills.

The active sand dunes at the Great Sand Hills are mostly pushed to the southeast by the prevailing winds. A tree that once grew at the edge of the dunes was eventually smothered, leaving only a branch above the sand.