The Bentonite Hills are located close to Hanksville, UT and the Cathedral Valley National Park. The Bentonite Hills appear as softly contoured, banded hills in varying hues of brown, red, purple, gray, and green. Bentonite clay (altered volcanic ash) absorbs water and becomes very slick and gummy when wet, making vehicle or foot travel difficult or impossible. Repeated cycles of absorbing water and then drying results in a popcorn-like appearance on the clay's surface. I can fully attest to "impossible travel" after a rain in September of 2023. A fun fact is that this is also close to the Mars Desert Research Society (https://mdrs.marssociety.org)
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