Bioreactor.

For the Lost River, definitely a Nuclear Reactor as there's an abundace of Uranite there and not a lot of small creatures or plants for a bioreactor.

I think there are some heat vents but they'renot around any of the skeletons, so I suggest putting a base near the Gargantuan for a wonderful view or in the acid falls (I think that's what they're called, the drop with all the acid waterfall things (It's close to the Garg skeleton)

But yeah, the Nuclear Reactor would be the best bet

Kindadumb isn't so dumb.

LOL

Yeah thats a great idea. I think i know where you're referring to by acid falls. I guess i can't build it near Gargantuan skeleton because of the little boy Ghost Leviathan cuz it can ram my base down, right?