I'm making some random landscapes for moders to create maps with if they wish.
Here is a "map" I drew of the first one. The blue is the river and ocean, white is the hills/cliffs and black or grey is lower elevation. White-Grey-Black is elevation like a Heightmap. The entire level will slowly slope downhill towards the ocean, the terrain in the plains near the ocean will likely be fairly flat. The white areas in the ocean will be islands.

I don't think I'm going to include a waterfall, I just want a steep hill between the gray and black areas where the river flows downhill that isn't climbable. I don't think The entire river can have water unless the water sheet is able to be set at an angle, which I doubt works in the game engine. But I can include some dips in the terrain where water can be placed. It's a work in progress. If anyone has any ideas to add feel free to share.
Also, if anyone wants to draw their own map I might be able to make a terrain from it too. Let me know.
I just wanted to release a pack of terrains for the community to turn into maps. I might go ahead and texture them(at least 1 I guess) to make the process easier for moders. Finishing touches can be done in TresEd.