Why was there a lake? Ariella stared ahead of her, the question driving herself crazy. She genuinely had no idea. She decided to at least take a chance, and she raised her hand cautiously.

"I would guess that they included a lake for educational purposes, so that the professors can provide some hands-on experiences. And for recreational purposes as well. They probably wanted a lake to be able to keep some aquatic life at Hogwarts." She paused for a minute, only confusing herself more. "And possibly for potion-making. A lot of potion ingredients we use here at Hogwarts come from the lake."