Black Lake
Location information

Hogwarts Castle's grounds

Permanent residents

Merpeople, Grindylows, and the Giant Squid



The Black Lake[1] (alternatively known as the Great Lake[2]) is a large body of water located to the south of the castle. It is about half a mile in diameter and the Hogwarts plumbing network drains into it.


Every school year at Hogwarts, first years sail across the lake to the castle led by Rubeus Hagrid in boats as per Hogwarts tradition. When they get to the school, they are then Sorted into their houses. In Harry's fourth year it is said that Dennis Creevey fell into the lake and that the giant squid carried him back to the surface.

At the end of every school year, graduating seventh years leave the school by sailing back across the lake.

Triwizard TournamentEdit

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Students from Durmstrang Institute arrived at Hogwarts on their enchanted boat via Black Lake. As part of the Second Task of the Triwizard Tournament, the four champions Harry Potter, Fleur Delacour, and Cedric Diggory, and Viktor Krum had to swim in the lake for one hour to rescue something that was taken from them. Harry used Gillyweed to be able to breath underwater, while Cedric and Fleur used the Bubble-Head Charm, and Krum partially Transfigured himself into a Shark.

Dumbledore's FuneralEdit

In 1997, Albus Dumbledore was laid to rest in a white tomb on the shores of the lake following his death in the Battle of the Astronomy Tower.


It is home to a Giant Squid, Grindylows, and a colony of Merpeople. The lake was also used as the site of the Second Task of the Triwizard Tournament. The Slytherin common room is beneath the lake, accessed through an entrance in the school dungeons. The Chamber of Secrets is also thought to be beneath the lake. At some point, Neville Longbottom's pet toad, Trevor, escaped into the lake, joining other toads that lived there.[3] Sea turtles can also be found within it.


The lake is very often cold, but Viktor Krum is known to have swam in it, apparently not affected by the low temperature (although this is probably due to the fact that his school, Durmstrang, is located in a place that is even colder).

Lily Evans and her friends were also said to dangle their legs over the water, which could mean that there were no rules whilst they were in school against swimming in the lake.

Behind the scenesEdit

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Notes and referencesEdit

Hogwarts Castle
Hogwarts grounds
Training Grounds · Secret room near the Training Grounds · Hagrid's cabin · Hagrid's pumpkin patch · Hagrid's garden · Secret Garden · Forbidden Forest · Hogwarts greenhouses · Stone Circle · Covered Bridge entrance · Quidditch Pitch · Incendio Challenge · Quidditch Gate · Broomshed · Entrance Gates · Entrance footpath · Pixie water well · Clock Tower Courtyard · Covered Bridge · Road to Hogwarts · Ravenclaw Duelling Arena · Quidditch Training Pitch · Gargoyle Gate · White Tomb · Black Lake · Ravine · Road to Hogsmeade · Lawn by Forbidden Forest · Path to Owlery · Path to the Whomping Willow · Locker rooms
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