Errr...

Victoria wondered why the professor asked such question. The answer is the same reason why everyone else's home or school have a lake - to feel refreshed.

"I don't think there has to be a particular reason why the lake was there. Maybe they just want to have it to feel relaxed or to feel refreshed." Victoria replied after some thoughtful thinking. "But of course, having a lake has more advantages than just for appealing attractions. I believe that it is also for protections for Hogwarts school from dangerous outcast that might attack our school...even if we do have a lot of enchantments protecting us, it doesn't hurt to have more." Victoria added on to her last statement, feeling more sastisfied with her answer.

"Didn't Durmstrang use the lake as a transportation route to come to Hogwarts in the 1994 Triwizards Tournament?"Victoria replied to the next question.