Matt - I believe the boundary as stated
here is 3ft from the floor, 5 feet from wall/post.
More specifically Rule 2:
Every wrestling area, no matter what size, must have a minimum three (3) foot safety mat area next to any floor surface and five (5) foot from any wall or post. Two (2) coaches’ boxes will be marked in appropriate locations within the safety area. The coaches’ boxes are to be no more than five (f5) foot in width. The wrestling area of the mat shall be based on the age group competing, as follows:
Under 11 must have a minimum wrestling area of 15'x15'
11 to 14 must have a minimum wrestling area of 20'x20'
High School must have a minimum wrestling area of 24’x24’
or a circular area of 28 feet in diameter