To the west is a large area with huge sand dunes.

They sat down against one of the small sand dunes.

"We ran back to the sand dunes where our things were."

The effect is rather like trying to run up a sand dune.

In 1923 it opened a test field by the sand dunes.

This is especially important in areas such as sand dunes.

The voice had come from the sand dune to my right, and I turned toward it.

He said there had been nothing here but a sea of sand dunes in the 1960's.

He stood on the top of a sand dune, looking out over the lake.

A beach and system of sand dunes are found at the mouth.