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[Pruvan]

In previous versions of DF it was possible to turn on "Show this or that at world embark" for things like, say, underground caves or rivers or that-other-stuff. But now this seems to have been removed from the game. I haven't been keeping track of recent development (post-40d) so does this mean that there is "always" going to be a (possibility?) for an underground river at my embark locations?

[shlorf]

AFAIK there are no underground rivers. Every embark is however guaranteed 3 different cavern layers (unless switched off in advanced map generation) which span multiple z-level can be connected and any number of them can contain lakes which will refill if they touch the map edge.

Spoiler (click to show/hide)

You are also guaranteed a 4th cavern below the last that will be filled with magma and a 5th cavern below which is filled with HFS

.
Magma pools are still in the game and tend to be found in areas with obsidian layers. Chasm are not in 3.18. Underground tunnels and roads I'm not sure about I think they're in but i never found one myself.

[Quietust]

All embark areas contain underground caverns and a magma sea, though I'm not sure if any of the caverns are guaranteed to contain water. Additionally, all embarks at least 3x3 in size are guaranteed to contain adamantine (and HFS) - one "cluster" appears in each 2x2 region on the embark map, so an embark region only 2 tiles wide or only 2 tiles tall has a chance of not getting any at all.

The only underground feature that's actually uncommon is an alternative entrance to HFS, and there's no way to make it show up on the embark map.

[Sutremaine]

You can check if you've got it by looking at your stocks screen as soon as you embark and seeing if there's any unusual weaponry there. It's better than nothing, at least.

[ltprifti]

or forbidden weapons or food would point to an underground civ

[BuGGaTon]

What!?  There are underground civs?!

[ltprifti]

there are unnamed animal civilizations, on my current fortress its antmen