This crescent-shaped ridge of sand dune in Oman was formed by strong trade winds that form a smooth hill facing the wind (left) and concave slipface on the back.

阿曼一座新月形的沙丘脊由强信风吹成，在迎风的方向（图左侧）形成一面平缓的凸破，在背风面形成凹坡。

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The towering ridge of a sand dune in the Arabian Desert points to the afternoon sun.

阿拉伯沙漠上一座高耸的沙丘脊指向着午后的落日。

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Search for bargains at the Tanger Outlet Mall, or head for Jockey's Ridge State Park, home to the tallest natural sand dune on the East Coast.

BBC: Daily deal: Two nights in the Outer Banks