Abstract: A portable playing court demarcation apparatus, for marking the bounds of a rectangular playing court, comprises a flexible outer boundary demarcation element the ends of which are joined to one another to form an endless element of a length greater than the perimeter of the playing court to be marked. The demarcation element includes four loop segments, each of the loop segments forming a corner loop of predetermined circumference, the element crossing itself at a corner point at the base of each loop at a generally right angle such that the longitudinal distance along the demarcation element between consecutive loops is alternately equal to the court length and the court width.