Where was the macOS Mojave desktop wallpaper photograph taken?

I'm pretty sure the dune is part of the Mesquite Flat Sand Dunes in Death Valley, CA

There are many dunes in the Mojave with big mountains nearby. I haven't been to Kelso Dunes and there are others in the Preserve but my guess is Amargosa Big Dune in Nevada near Death Valley National Park, except that Apple focuses on California usually. There is plenty of Mojave Desert in Nevada and some in Utah and Arizona do maybe California isn't the default this time. Anyway, Big Dune is pretty cool.

I've seen the dunes in Death Valley look like this.

my guess was the Eureka Sand dunes in northern part of Death Valley, also called the singing sane dunes.

Looks to me that the photograph element is only the mountain background. The dune itself looks like a computer generated image.

Looked at my pictures of and from the top of Kelso dunes.... the mountains look too far away for it to be from there but I can't say for sure. Fun dunes to climb though, they "boom" as you slide down them!!

I'd like to know to where it's taken.

A photographer with a big telephone lens can shorten the distance behind the dune to make the mountains seem nearby. I'm sure that was done for this photo but hard to say how much distance was fore-shortened.

Even if you knew the location, I doubt it looks like that anymore. Dunes are constantly shifting and moving. It would take a lot of luck to be able to stand in the same spot and ever get the same image.

I think you just found out what the next version of MacOS will be named. MacOS Eureka

It looks so much like Wadi Rum in Jordan. There's a sand dune there just like this that you can snowboard down.