The lake is located on the south side of the castle, which stands on a cliff overlooking the water. It is about half a mile in diameter and the Hogwarts plumbing network drains into it. A number of magical creatures inhabit the lake, including a surprisingly friendly giant squid, often seen near the surface, a colony of merpeople inhabiting the bottom, and a population of grindylows. The grounds around it are popular spots during good weather to recline and hang out.
