The Mesquite Sand Dunes are at the northern end of the valley floor and are nearly surrounded by mountains on all sides.
In between many of the dunes are stands of creosote bush and some mesquite on the sand and on dried mud, which used to cover this part of the valley before the dunes intruded (mesquite was the dominant plant here before the sand dunes but creosote does much better in the sand dune conditions).