Here's the fourth and final map for this particular run, connected to the 3rd level by that underground river chase sequence bit that I mentioned. That part's unmapped, mostly a series of skill rolls and such to navigate safely around jutting stalagmites and rocky outcroppings, and over small waterfalls without capsizing.
Then they'll be dumped out here, in an lake deep underground, which happens to be the lair of the aboleth running the show, complete with creepy non-Euclidean shrine.
Pretty happy with the waterfall, less so with this version of that water effect I've been playing with. Should be a fun game night, and a good culmination for this adventure.
Now on to something different, I'm sure my PCs are completely sick of goblins, water, and watery goblin aboleth thralls.
Thanks for looking!