I've been planning a very long, fairly sneaky trip into Nahanni for a couple years now with friends to explore the caves and a few other places you aren't allowed officially. I'm almost ready but there's ONE place i cant seem to find. I thought i had it a few times, narrowed it down to a few places but im really not sure. Id appreciate any opinions i can get at this point before i set off having to scratch this off my list. The video i posted is about where it starts them getting near the area, i've watched the entire thing of them getting to that point and ive searched and searched but cant seem to narrow it down, its a big country. I have a few places in mind id love to have some decent minds come in and help me find this hidden valley that apparently disappears into a cliff before i set off and have to scratch this off the agenda. I plan on filming my entire trip and hopefully making some kind of film out of it, even if i get a fine for exploring caves etc. (against park rules)
I know this is a stretch, ive posted this in /x/ aswell due to the nahanni legends hoping it would drum up some interest but would appreciate any input. Thank you.

https://youtu.be/zr1v5N6ovp4?t=4459