The high pitch sound of water that was hitting the solid surface was the only sound they could hear as they were getting closer and closer to the endpoint. It seemed both of them knew it was the source of water that was flowing in their hands and feet.
As soon as they have reached the place, Riku was literally shocked as it was the first he could see a beautiful place like this. That he never expected it was also possible in the real life.
Falls: it was the right term for how you describe the mild water that was coming from above and gently hitting the marble surface, which made the water splashes all over the place.
Yet, for some reason, the sunlight was entering the small hole above them and shining the calm blue water around them. And again, for this place was just an ordinary place for her as she seemed often to see a such beautiful like this. But for Riku, it was a magical cave that he never anticipated that he'll be given a chance to see this scenery.
