The waterfall idea sounds great, but I have an Idea for making a waterfall without having to directly create the waterfall. I was thinking about a water-spring that produces water from underground and bubbles out water onto the surface. If it was on a cliff then it would do the same thing as a water fall. And we could make a setting so that there can be only a certain amount of water in the map, but that would not be completely necessary if the sides are open so that water can run out of the map or if we have a water-level system.