Quicksand Fans

I don't recall seeing this posted and just found it by chance chatting to a guy about quicksand and sharing links.

Sorry it's a guy in the vids but some of the quicksand he finds is fucking amazing!

https://www.youtube.com/user/wamhiker/v ... _polymer=1

I found these just this week. I agree; the locations are something else. Lucky guy.

Where is this place?
Is it in the US?