The black lake stretches for some distance along the shores of Hogwart's Castle and is home to the school's own Giant Squid. Some say if you stand out here long enough yelling his name you might catch a sighting of him but some may be lying and you'll possibly end up with a sore throat but no squid to show for it.

Along the edge of the lake is a small swimming dock for the adventurous who don't think walking into the water is a big enough entrance. By the dock are small boats that can be taken out for a lovely afternoon of sailing--after you've gotten the Groundkeeper's permission. Be sure to wear the life vests and no pushing!

There are also several trees by the lake, one with a hole and a hollow inside filled with books that have been left there over time. If you take one, be sure to place one in exchange to keep the system alive.