Examples from literature

• It was a low shore on which the fine sand, some fifteen feet deep, lay drifted into hillocks or dunes. 
• The dunes extend for miles: an empty wilderness of sand with the grey North Sea beyond. 
• The loose sand, in which these shells are packed, is heaped into low, straight, long lines of dunes, like those left by the sea at the head of many bays. 
• This time the tide was in, so he crossed the dunes and struck the shore on the further side of the quicksand. 
• We were thrown out upon the dunes.