Step 1: Identify the back cliffs and try to match them with the thin cliffs above, like in this example.


Step 2: Copy the top-right parts of the thin cliff if the back cliffs are facing the right. Copy the top-left parts of the thin cliff if the back cliff is facing left using ctrl-click.


Step 3: Paste them on the matching high dirt cliff. (As you can see, some white is outlined on the bottom of a part. This helps blend the parts to high dirt)


Step 4: Repeat Steps 1-3 until all of the back high cliffs are replaced with water. If you cannot find the apropriate pairs, re-do the thin cliffs by running along the bottom with the isometric tool.


Step 5: Replace the remaining dirt along the top of the back cliffs with water tiles


Step 6: Form the corners of the cliff. There are many ways to do it; this is one way to do it.


Step 6a: Get these tiles and replace it with the top part of the cliff.


Step 6b: Get this tile from a thin high cliff, and replace it with the other tile.


Step 6c: Do the same with the other side.


Step 7: Touch up the surrounding water cliffs by copy and pasting the corner water cliffs closer to the high ones, then replacing the dirt with water. Do the same with the other corner.


The piece is complete!