Thoughts about my water works

This water, that is gently flowing along the channel between the two paths, comes from where exactly? This when real life starts to encroach far too much into here. We all know water goes downhill from a source but does it have to on this island? The answer is undoubtedly, yes. I could make the water do pirouettes in the sky if I wanted it to. However, the degree of realism and authenticity wanted for this island become very clear at an early stage of the design process. So, I repeat, where does this water come from? Thoughts at the moment revolve around this steep mountain side. It is at this point too, that the gravel paths change into a single wooden path that snakes around the side of the mountain - this would be a good point to introduce the water into the man made channel, perhaps from a mountain stream or waterfall.