This is an example of the
typical curved land mass.
Step one is to raise a single tile of land
Next Raise a second block
Next raise on edge of the second bock to make a point.
Next drag edges of adjacent tiles up to join the edges of the first two
tiles. Note that the land smooths at the edges when it is properly joined.
Do this on both sides of the original two tiles this angle gives you a good
view of what is going on
Complete the curve by bringing up additional tiles adjusting the angle of
each subsequent tile to be more steep than the previous one.
Finish joining the edges of the adjacent tiles
Using white land texture you can create the illusion of an even smoother
surface. Add walls or building pieces of choice.
Vodhin's spotlights create a colorful effect to show some other options with
surfaces like this.
That is a basic technique, it is up to your creativity to come up with new
uses for the method.