Ground-Floor Corridor

The Ground-Floor Corridor encircles the Middle Courtyard. It connects the training grounds to the rest of the castle. It contains the Temporary Defense Against the Dark Arts Classroom, Classroom 4F, Professor McGonnagal's Office, and Professor Sprout's Office. It is connected to the Herbology Corridor, the Dark Tower Corridor, the Charms Staircase, and The Turris Magnus Staircase. It also has a section off of the Grand Staircase, which leads to The Quad and Classroom 11. It also contains the exit to the Philosopher's Stone Chambers.