"Tell you what, use the prefects' bathroom. Fourth door to the left of that statue of Boris the Bewildered on the fifth floor. Password's 'pine fresh.' "
-- Cedric Diggory (GF23)
The Prefects’ bathroom is located on the fifth floor, fourth door to the left of a statue of Boris the Bewildered (GF23). Fred and George created a magical swamp in the east wing corridor of the fifth floor (OP30).