The whole area is very intense. Topock Gorge is something else, and yes, there is a large dune back in there.http://digital-desert.com/topock-gorge/
A shot of the dune is I think the 13th photo in the tour.
I had a friend that owned a canoe/kayak rental in the Topock marina a few years ago. He sold out since then, but I took a canoe trip down to Lake Havasu and did the tour linked above. Another time I took my then 13 year old granddaughter out before sunrise into the Havasu Wildlife Refuge and we did a morning shoot in the marsh. Back on track though, the Mohave warriors (Kwanamis) would live in that area in your shot and practice war separate from the population that lived near Laughlin at the base of Spirit Mountain (Avi-kwa-me). The Kwanamis lived for war didn't hunt. They were brought food by the people so they could concentrate on killing. Very heady stuff to me. I've done quite a bit of study on the Mohave.
An interesting side trip is the Topock, or Mystic Maze. http://digital-desert.com/mystic-maze/
The maze was most likely made by the people that inhabited the area before the Mohave. There is/was some controversy regarding that though. The railroad claimed that it was made by Indian workers raking up rocks for the pilings on the bridge. They had no proof, and there is a fairly vague tribal memory of the maze being there long before white man came around. There's also a bat cave near by, but bats creep me out. They're about the only thing in the Mojave I don't find fascinating.
There's a lot of history in the area north of Needles. Explorers, pioneers, massacres, mining, the military and Indian suppression, even steamboats.
Anyway, I wish I had kept up my blog. I covered a lot of the above on it. Continuing briefly, the mountains from what I've heard are called the Turtle Mountains. Mohave creation tales/legends (I hesitate to call them myths because they are very real to the people) include a battle in the area between the progeny/descendant of the creator and evil outside forces. The forces were beaten back and as part of the truce that was made, the Mohave people were told never to live south of those mountains (the CRIT resevation is south of there now however). That's why the Kwanamis warriors favored the desolate area. That's all some very sacred ground. Maybe next year I can start getting back out that way.