The Demise of the Elderlings (Spoilers for all books, especially RWC)

[Farseer]

I think that the reason there are only two cocooning grounds, both along the same river, is that the Memory Stone only comes from one place - namely, the area including Kelsingra, the Stone Dragon Garden, and Verity's Quarry. Dragons need this stuff to cocoon, and this river, whose headwaters are presumably near the source of this stone, is the only place where one can find Memory Sand.

I'm still going through but thought I'd comment while I had it in my head...I was certain that there was a source of memory stone in a quarry on Aslevjal (or somewhere in the Out Islands), and it was from there that the Pale Woman quarried the stone to make her dragons?

Loving it so far !!!