Arches National Park is obviously home to a few arches. It is also home to some great slick rock, red rock, and rock dunes. Rock dunes? Shouldn't dunes be made of sand? Yes, but sometimes they get buried and compressed into rock. Normally they are compressed into sandstone, but in Arches there are some petrified dunes. So they look a lot like dunes even though they are rock.
Here are the petrified dunes with the La Sal Mountains rising beyond at sunset.
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