>>3789659It's just one of the many basins in the Rockies that go by the name "Missouri" yet has no geographic relation to the Missouri River.
It's possible you've driven by one or two of them, though many I find in mostly abandoned towns down smaller highways and even dirt roads in the far northern Great Plains. It's really a cool area to just wander and spend time. I'd driven through a few times in the past while heading to other destinations, but this year I made the plains the destination and had a few great trips there.
>>3789645Neat.
More dunes.