How then can the dune fields produced by windblown sand be so similar?

The ground between here and the Uplift is incredibly flat, broken only by the dune field itself.

The dune field is larger than the city it swallowed.

The crater contains a 35 x 65 km dark dune field.

A "dune field" is an area covered by many sand dunes.

Leaving the dune fields far behind us we are soon back into the mountain desert.

The dunes to the north of us, they're the biggest dune fields in the solar system.

Thus the overall position of the dune fields remains more or less fixed.

After walking through several doors, she finds herself on a hilltop, and climbs down to a dune field.

A primitive campground is located at the north end of the dune field.