TKH
Slots, although the ones I am going to show you are located relatively close to Sin City, they are not that kind of slots. I mean slot canyons, or more broadly, narrows in otherwise wider canyons.
They come in all sorts of sizes in terms of depth and width. I have been in slots where I had to walk sideways still was scraping the walls with my butt and gut without wearing a backpack. I also have walked in slots where you could have walk five or six people side by side. The following pictures are all from some of the somewhat wider slots located between Canyonlands NP and Zion NP. Makes taking pictures easier.
The first slot I came across on Southern Utah was in 2019 during my first traverse of Southern Utah. It is the Happy Canyon slot canyon. I had walked out of Canyonlands NP into Glen Canyon National Recreation Area and descended into Happy Canyon. It was a hot, shadeless walk along a wash in a wider canyon. The wash meanders inside the canyon to and fro. The hike “as the cow walks” is at least twice as long compared to “as the crow flies”. Finally the sand and gravel in the wash gave way to slickrock and soon I stood at the start of the slot canyon. I did manage to get in, but soon found myself on top of a dryfall with a deep pool below. I figured that I could get down, but I did not know whether there was a dryfall further down in the slot that I might not be able to climb down. In that case I would have to return the way I had come and there was no way that standing in the pool I would be able to get up on the dryfall I was standing on.
This is the view of the down climb into the slot canyon right at its start.