searching for adventure with a waterfall setting

[zong]

Hi to all, I'm italian Dm and this is my first thread.
I write because I need some aid.
Some weeks ago I found a publisher site where I saw an adventure/supplement with the concept of a great mysterious waterfall at the base of which lived many human and humanoids settlements: the top of the waterfall was a great mystery because no one managed to reach it nor someone returned alive.
I searched again for this site but I've never found it again.
Could someone tell me which product is it?

Thank you very much!

 

[Emirikol]

AC8 REVENGE OF RUSAK.

It even comes with a 3D cardboard waterfall.

I think you can download it from Paizo.com for like $2.00

jh

 

[zong]

Thank you,
but it's not AC8. It was a d20 product