Its not Kiso, but I know what you mean, since I also travelled along that valley.Yes...please do notice that in my post above yours just above, is the following too:
...even to various degrees shaped by them...
Oh...and just this little bit of off-topic here (even though this thread is not so fixed, actually) I have been to that area in Kiso--I live in that prefecture (Nagano). It had been a large rock formation that had been washed out over time, and the rocks now standing are what is left of it. It's a beautiful spot.
Its a smaller, steep (and beautifull water with lots of different basins and waterfalls) one, near a spectacular artist village with lots of nature installations and architectur workshops, a few miles about south Suwa lake, then west side up. The name is somewhere in my piles, sorry.
Local artists took me there, its very nice!
I may post some pics some time later.
(sorry for the off topic)