http://www.renderosity.com/mod/gallery/index.php?image_id=1426277

If you are talking about the cliff formation of the right - it's a premade mesh for sale at runtimedna.

oh,ok.Well now thats cheating(; I got all fired up and excited thinking I was missing something:D Thanks for the reply.

there are still many ways to make something like that. I think there are some tutorials about complex terrain formations on this site.

I will look into it thanks,but I honestly dont think Vue can do that just yet.And oh how I would love to be proven wrong.Terragen 2 can do it no problem.Quite a bit more complex in fact.e-on should take some lessons:D

I would create the top part, flip unside down, add to the bottom part and then blend into the third terrain.  A lot easier than trying to carve an undercut.  

The other method is to create a canyon terrain and then turn it on its side. 

Attached Link: http://www.renderosity.com/mod/tutorial/index.php?tutorial_id=703

Don't forget this fantastic tutorial by czarnyrobert.

It has everything you need to know to make this kind of rock formations in Vue.

Thanks agiel, I missed that Tut!

You can also use twist to get a nice overhang effect.  Create a terrain.  Make it high for the parts that will overhang.  With the terrain selected, click the Numerics tab.  The second icon from the bottom is Twist.  Just grab the Z=>Y or Z=>X arrow point and give it a good pull.  The trick to this is you get one chance - don't try to twist it again - the whole terrain will screw up.  You can undo it and try again...  It take a few trys to get a good look, but it really does work fine.

Not an exact answer, but often people get good looking odd terrains by tilting them, using them upside-down and such - as Keenart suggests.

Sometimes poking one terrain up through another is good too.

Here is a single flat clipped terrain turned on its side, you could do a little more rounding and add a more suitable material. Nothing spectacular, but you can see how a terrain can create an overhang, by painting the surface and then clipping the terrain from the bottom up. You could create special smoothing or blending filters, you could do a lot more.