This is what I have come up with for now, if anybody knows of another way to make a better land bridge then post up!
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Good experementation. I would keep looking for perfect blends though... Land bridges are possable and have been done by Wilhelm, Rantent, Ghost-, and I. I don't feel like posting a ScreenShot right now, if you wish to presue this further, PM me on SC at WoodenFire@USEast.
To clerify on the concept of a "land bridge", it is actually a path piece that allows a road to continue flatly over where the land sinks down. This has been misinterpreted after I released my first "land bridge". I probably should've made this clear when I made my first piece, but, feh, what's it matter? The second screenshot is the best. The bottoms of the cliffs and the bits where the bridge start need some work, but it's still quite nice. See if you can blend the bottom of the cave into high dirt/ruins/bridge.
The last pne is pretty bad, but the first two are nice, except for a bit of blockiness. Good experimentation.