That spot in the yard where a waterfall and pond would look the most natural is most often the worse location for the pond. It’s often a hill that spills down to an area around the deck. Perhaps it’s hard to grow grass on the hill and the hill is eroding. Instead of planting low-growing junipers like everyone else in the neighborhood is doing, you may want something more dramatic like a lively waterfall that splashes into a nice, big koi pond. After all, it would look natural spilling out from the line of trees on top of the hill.