Basically a regular jungle, but the trees grow from a shallow swamp with swamp colored water. It isn't THAT complicated, is it? If so, here's a visual representation of what it should look like (but with jungle trees)
A desert with lot's of trenched in area. More visual representation, because I'm too lazy to explain it's appearance to you!
Again, not hard to explain. BUT this time, there'll be two types which can be easily interpreted by looking at the images below.
Hope you enjoyed this fairly generic but potential idea. Would actually be interesting to see these make it into the game.