This corridor is one of the many corridors in Hogwarts Castle. It is located on the Grand Staircase side of the castle on the seventh floor circulates The Quad. The corridor begins in the Grand Staircase Tower at the seventh floor level and passes around The Quad, including the Room of Requirement. It then leads to another staircase: in the 1995-1996 school year and earlier, the Divination Staircase was located here; but in the 1996-1997 school year, Horace Slughorn's Staircase is located here.
The entrance to the Gryffindor common room is located behind the portrait of the Fat Lady on the Seventh Floor of Hogwarts Castle. A password is required to enter it. A circular hole is behind the painting leading to the common room.